Can I keep my comcast.net email after cancelling Xfinity?

Yes, if you signed in through the Xfinity Email website during the 90 days before disconnecting. Keeping it afterwards depends on staying active. Comcast describes that window differently across its own pages. Sign in on the website every few months rather than relying on your email app. Keep a local backup as insurance.

Why am I not receiving Comcast emails?

Check the storage meter first, because a full 10 GB mailbox makes Comcast refuse incoming mail while sending still works. Then check the Spam folder and your filter rules under Settings and Mail. Only then suspect the sender or your email app.

Comcast Email Settings: IMAP, SMTP, POP3 and Xfinity Setup

Q: What are the Comcast email IMAP settings?

Use imap.comcast.net on port 993 with SSL and smtp.comcast.net on port 587 with TLS for sending. Sign in with your full @comcast.net address and your Xfinity password. Full tables are in the IMAP settings section.

Q: Does Comcast use app passwords?

No. There is no app password page to find, which is why hunting for one wastes so much time. Your Xfinity password is the correct password, paired with the access switch. That changes only after the Yahoo upgrade, where Yahoo app passwords take over.

Quick answer: the Comcast IMAP server is imap.comcast.net, port 993, SSL. SMTP is smtp.comcast.net, port 587 with TLS. POP3 is pop3.comcast.net, port 995. Sign in with your full @comcast.net address and your Xfinity password, but first switch on Third Party Access Security in webmail or every app is refused. Accounts already upgraded to Yahoo Mail use Yahoo servers instead.

Every value here came from Comcast's documentation and a working connection. Univik tools have signed in to imap.comcast.net for real backups since 2013 and we track the Yahoo move as it rolls out. See what changed →

What Changed Recently#

Comcast email is in the middle of the biggest change in its history. Read this before you touch any server field.

Latest update

Comcast.net email is moving to the Yahoo Mail platform. Comcast now invites account holders to upgrade their @comcast.net mailbox to Yahoo Mail at no cost, in phases. Your address stays the same and your mail, folders and contacts come along. The catch for anyone reading this page: once you accept, the comcast.net servers stop being your servers and you have to reconfigure every email app with Yahoo settings. The Yahoo section below has those values and the migration gotchas.

Forwarding warning

Forwarding and filters do not survive the upgrade. Comcast states plainly that forwarding settings are not moved and all forwarding stops once your mailbox becomes a Yahoo mailbox. Filters go the same way. If mail from your comcast.net address has been quietly forwarding somewhere for years, rebuild it in Yahoo Mail settings straight after upgrading or those messages just stop arriving.

The Gmail change

Gmail no longer collects Comcast mail for you. Google retired the POP fetching that let Gmail collect mail from other accounts. Anyone reading comcast.net mail inside a Gmail inbox lost that feed. Mail already pulled in stays put. To keep reading, connect Comcast directly in an email app with the settings below or forward from the Comcast side while forwarding still exists.

The port retirement

POP port 110 is dead and port 25 was never supported. Comcast retired unencrypted POP on port 110 and requires port 995 with SSL instead. Old profiles carrying 110 fail silently. Port 25 stays blocked for outgoing mail to fight spam, which is why 587 is the outgoing port on this page.

Current status: both platforms run side by side. Not invited yet or invited and declined? The comcast.net servers on this page keep working. Accepted the Yahoo terms? Use the Yahoo values. Comcast says the upgrade is optional.

Before You Begin#

Comcast has 2 gates that stop setups before any server value matters. Clear both and the rest is 5 minutes of typing.

1. Switch on Third Party Access Security

Comcast can refuse email apps at the account level. When that box is unchecked, Outlook and Apple Mail are rejected no matter how perfect your settings are and the error just says the password is wrong.

Where: The 4 step fix below →

2. Check which platform you are on

Comcast mailboxes are moving to Yahoo Mail one invitation at a time. Sign in at connect.xfinity.com: a prompt to accept Yahoo terms means you are being moved and a mailbox already on Yahoo needs Yahoo servers, not the comcast.net ones.

Where: Yahoo Mail settings below →

About Comcast Email#

Comcast email, branded Xfinity Email since Comcast introduced the Xfinity name in 2010, gives every Xfinity internet account a free @comcast.net mailbox.

Two things make it unusual among big providers. Comcast lets you keep the address after you cancel the service, so millions of @comcast.net mailboxes belong to people who left years ago. And Comcast blocks email apps by default through an account setting rather than a password system, which is why so many correct setups still fail. Comcast has now partnered with Yahoo to move these mailboxes onto Yahoo Mail, which changes the servers under the same familiar address.

Comcast or Xfinity, same mailbox: Xfinity Email is the current name for what people still call Comcast email. The address stays @comcast.net, webmail is at connect.xfinity.com and your Xfinity ID signs you in to both.

Service Name	Xfinity Email, still widely called Comcast email
Owned By	Comcast Corporation
Mail Platform	Comcast infrastructure, moving to Yahoo Mail by invitation
Email Domain	`@comcast.net`
Webmail URL	connect.xfinity.com
Protocols Supported	IMAP, POP3, SMTP
Password for Email Apps	Your Xfinity password, once third party access is on. Yahoo app password after the upgrade
Mailbox Storage	10 GB per account

Why former Xfinity customers lose addresses they thought were safe.

Former Xfinity customers, read this. Comcast keeps your address after you cancel only if you signed in through the Xfinity Email website during the 90 days before disconnecting. Staying active afterwards is the part people trip on: Comcast's own pages describe the activity window differently in different places, from 9 months in the former customer guidance to 24 months in the activity policy and the Yahoo upgrade page counts an account as active if it was signed in to within 2 years. The safe habit is simple. Sign in on the website itself every few months, not just in your email app and keep a local backup so a deletion is never the end of your mail.

Comcast Webmail Login#

Webmail settles most arguments about whether a problem is your app or your account and for Comcast it is also where the access setting lives:

Webmail

connect.xfinity.com

Access and Security

Webmail → gear icon → Settings → Security

Account Status and Help

xfinity.com/email

Comcast searches attract more fake helplines than most. Search "comcast email settings" and you will meet pages stuffed with toll free numbers, sometimes repeating the same number every few words, posing as official support. Comcast doesn't charge for server settings and neither does anyone else. Never phone a number you found in a search result to fix email settings. Every value you need sits on this page at no cost.

Turn On Third Party Access Security#

This is the step that breaks more Comcast setups than every wrong port combined. Comcast keeps a switch that decides whether email apps may reach your mailbox at all. With it off, your app reports a rejected password while webmail signs in perfectly with that same password. People then hunt through server settings that were never the problem.

Sign in to Xfinity Email at connect.xfinity.com with your Xfinity ID and password.
Select the gear icon in the top right corner, then Settings.
Open Security.
Tick the box under Third Party Access Security to allow email apps in. Unticking it locks them back out, which is the point of the setting.

The rejected password that is not a password problem at all.

Worth knowing: accounts already using an email app usually have this box ticked, so a setup that worked for years and suddenly stopped is more often a changed Xfinity password than a flipped switch. Check the box anyway, it takes 20 seconds and rules out the biggest single cause.

Comcast IMAP Settings#

IMAP keeps your mail on Comcast servers so every device shows the same inbox. Comcast recommends it over POP for exactly that reason and so do we.

About that STARTTLS instruction: Comcast's own setup article adds a line telling you to pick STARTTLS if your client offers an authentication method dropdown. It reads strangely beside SSL on port 993 and it trips people up. Treat them as 2 separate fields. Encryption stays SSL on 993. The authentication dropdown, where your client has one, takes STARTTLS.

IMAP Server	`imap.comcast.net`
Port	`993`
Encryption	SSL/TLS (required)
Username	Your full email address, including `@comcast.net`
Password	Your Xfinity password. Comcast has no app password system, which is why the access switch matters instead
Authentication	Required

Comcast POP3 Settings#

POP3 downloads mail to 1 device. Comcast supports it but steers people away from it and the old unencrypted port is gone. Not sure which to pick? See the comparison below.

POP3 Server	`pop3.comcast.net`
Port	`995`
Encryption	SSL (required). Port `110` is retired and will not connect
Username	Your full @comcast.net address. Not your Xfinity ID if that is a mobile number
Password	Your Xfinity password

Careful with POP3 delete settings. Older profiles often delete server copies without asking twice. Leave "leave a copy on the server" ticked or connect.xfinity.com loses whatever POP pulls down.

Comcast SMTP Settings#

Encryption is not optional: Comcast takes secured connections and nothing else. Comcast retired plain port 110 and never allowed port 25, so an old profile carrying either just times out.

SMTP handles outgoing mail. Comcast publishes 587 as the outgoing port with TLS and lists 465 with SSL as the fallback when an app insists on it. Port 25 is blocked outright to fight spam, so any guide offering it is years out of date.

SMTP Server	`smtp.comcast.net`
Port (TLS)	`587`, the port Comcast documents
Fallback Port	`465` with SSL, only if your app needs it. Port 25 is blocked
Encryption	SSL or STARTTLS (required)
Username	Your full email address
Password	Same as incoming mail
Authentication	Required. Comcast rejects unauthenticated sending, so that checkbox is not optional.

Check Comcast IMAP Settings Online#

Checking Comcast IMAP settings online needs nothing but this page, where every value is verified and copies in 1 tap. The wrinkle for Comcast is which platform your mailbox sits on, so check the address here and read the Yahoo section if you have upgraded.

Does my email address use these settings?

Runs in your browser only. Your address is never sent anywhere or stored.

Testing the account itself takes 2 clicks. Sign in at connect.xfinity.com to prove the address and password work, then open Settings → Security and check that third party access is ticked. Pass both and every table above connects.

Look Up IMAP Settings for Any Email Domain#

The tables above are for comcast.net addresses only. Got other mailboxes to set up, maybe a work address on a company domain? Our free lookup database imapsettings.com covers those.

imapsettings.com

Complete email settings database, by Univik

Check IMAP settings online →

Enter any email address and get the incoming and outgoing server settings for that domain in 1 step:

Incoming server: hostname, port, SSL/TLS and username format

Outgoing server: SMTP hostname, port and encryption

Your address is used only to find the settings for that domain. Nothing is stored or shared.

Which Password Does Comcast Want?#

Comcast works differently from Gmail and Yahoo here and knowing that saves an hour of searching for a page that does not exist. Comcast has no app password system. Your ordinary Xfinity password is the right password for Outlook, Apple Mail and your phone. The third party switch controls access here instead of a generated code.

Where you sign in	Which password	Extra step
connect.xfinity.com webmail	Xfinity password	✗ None
Outlook, Apple Mail, phone apps on comcast.net servers	Xfinity password	✓ Third party access on
Any app, after the Yahoo upgrade	Yahoo app password	Generated at Yahoo

Change your Xfinity password and every app stops. Email clients keep the old one and retry it until you update each device by hand. Comcast won't do it for you and repeated failed attempts from a phone in a drawer are a fine way to look like an attack on your own account.

Set Up Comcast in Email Clients#

There's no Comcast sign in window for apps to open, so each client below gets the values typed in. Switch on third party access before you start. Choose yours:

Outlook Apple Mail iPhone and iPad Android Thunderbird

Outlook (Windows and Mac)

Open Outlook → File → Add Account or Settings → Accounts → Add account in new Outlook.
Put in your @comcast.net address, then open Advanced options and tick "Let me set up my account manually". Outlook can't autodiscover Comcast reliably, so skipping this is what produces the endless password prompt.
Choose IMAP and enter imap.comcast.net port 993 SSL incoming, smtp.comcast.net port 587 TLS outgoing.
Enter your Xfinity password and tick "My outgoing server (SMTP) requires authentication" with "Use same settings as my incoming mail server".
Finish and send yourself a test. A rejected password here almost always means the access switch is still off.

Apple Mail (macOS)

Open Mail → Settings → Accounts → Add Account and pick Other Mail Account, since Comcast isn't in Apple's list.
Fill in your name, @comcast.net address and Xfinity password and carry on.
Set the account type to IMAP when Apple Mail asks, not POP.
Fill the server fields with imap.comcast.net and smtp.comcast.net when Apple Mail asks.
Enable Mail in the checkbox list and finish.

iPhone and iPad

On iOS the path runs Settings → Apps → Mail → Mail Accounts → Add Account → Other.
Tap Add Mail Account and fill in your name, @comcast.net address and Xfinity password.
Keep IMAP selected at the top of the next screen.
Enter both servers exactly as written above, incoming and outgoing.
Tap Save. Verification failing here points straight back at the access switch.

Android

Open Gmail, Samsung Email or your mail app and add an account, choosing Other or Personal (IMAP).
Enter your @comcast.net address and Xfinity password, then pick Manual setup if offered.
Set the account type to IMAP, never POP3, so your phone stays in sync with your computer.
Enter the servers: imap.comcast.net 993 SSL incoming, smtp.comcast.net 465 SSL outgoing.
Finish up, then swipe down once to bring the folder list in.

Thunderbird

Start at Account Settings → Account Actions → Add Mail Account in Thunderbird.
Give it your name, @comcast.net address and Xfinity password, then Continue.
Check what Thunderbird guessed. It often proposes the right hosts but the wrong outgoing port, so set 587 yourself and keep IMAP selected.
Select Done and let the folder list build on first sync.
Select Done. Folders sync on first open.

Comcast Webmail Settings#

The tables above connect your apps. This section covers the mailbox itself, all of it behind the gear icon at connect.xfinity.com.

Signature

Settings → Mail → Signature. Applies to webmail only, so Outlook and your phone keep their own signatures.

Vacation Auto Reply

Settings → Mail → Auto Reply. Comcast sends it from the server, so it runs with your computer off. Set an end date or it keeps replying long after you are back.

Filters and Folders

Settings → Mail → Filter Rules. These run on Comcast servers, which sort your mail before your devices see it. These filters do not survive the Yahoo upgrade, so keep a note of them.

Spam and Blocked Senders

Settings → Mail → Advanced Settings for spam handling and Blocked Senders for individual addresses. Check the Spam folder before deciding a message never arrived.

Comcast POP3 vs IMAP#

Comcast makes this choice easier than most providers. It recommends IMAP openly and it retired the unencrypted POP port that half the old guides still print.

Why Comcast steers everyone to IMAP and why old POP profiles fail outright now.

Feature	IMAP	POP3
Where mail lives	On Comcast servers (imap.comcast.net)	Downloaded to 1 device (pop3.comcast.net)
Multiple devices	✅ Everything stays in sync	❌ Each device sees different mail
Sent and deleted mail	✅ Synced everywhere	⚠️ Stays only on that device
Offline reading	⚠️ Cached mail only	✅ Full local copy
Server storage used	Yes, counts against your quota	Can be freed after download
Best for	Phone + computer, everyday use	Single PC, local archives

Our verdict: pick IMAP. Comcast recommends it too and with a 10 GB mailbox the offline copy argument for POP is better served by a real backup. A backup tool is the right way to hold an offline archive, especially with a 10 GB ceiling forcing regular clear outs.

Comcast Sending and Storage Limits#

Comcast enforces a mailbox quota that stops incoming mail dead, which is worth knowing before it happens to you:

Mailbox storage	10 GB per account. Reach it and new mail is rejected with a quota notice from postmaster@comcast.net until you delete enough to drop below the line
Maximum message size	25 MB total, counting attachments, headers and formatting together. Messages a little under 25 MB can still fail because encoding inflates attachments
Blocked attachments	Comcast refuses certain file extensions outright whatever the size, with the list published alongside its sending limits
Recipients per message	100. A message addressed to more than 100 people is not delivered at all
Recipients per day	1,000. Pass it and the account stops sending for the rest of the day, so 1 message to 100 people spends a tenth of the daily allowance
Outgoing port 25	Blocked. Use `587`

The quota trap: a full mailbox looks exactly like a broken email setup. Mail stops arriving while sending still works and your app reports no error at all. Check the usage meter in webmail before you rebuild an account that was fine all along.

Troubleshooting Comcast Connections#

Find the exact error your email app shows, then apply the fix:

Error you see	What it means	Fix
Password rejected in the app, accepted in webmail	Third Party Access Security is switched off	The signature Comcast failure. Tick the box in webmail under gear → Settings → Security, then try the app again without changing anything else.
Worked for years, stopped this week	Your Xfinity password changed or the mailbox moved to Yahoo	Update the saved password on every device first. Still failing? Sign in at connect.xfinity.com and look for a Yahoo prompt, then switch to the Yahoo servers.
Receiving works, sending fails	Outgoing port or authentication is wrong	Use `smtp.comcast.net` on `587` with TLS and tick outgoing server authentication. Port 25 never works on Comcast.
Cannot connect on POP, no error detail	An old profile is still pointed at port 110	Comcast retired unencrypted POP. Change the incoming port to `995` with SSL or better, move the account to IMAP.
Comcast Email Sending Limit Exceeded	You crossed the 100 recipient line, went past 1,000 for the day or Comcast read the traffic as automated	The notice arrives from do-not-reply@comcast.net and sending unblocks on its own. Check for a mail app stuck in a retry loop, which quietly burns the allowance while you sleep. Genuine bulk sending belongs on a service built for it, not a residential account.
Mail stopped arriving, nothing looks broken	The 10 GB mailbox quota is full	Check the usage meter in webmail and clear space. Back up first so deleting years of mail is not a loss.
Account gone after leaving Xfinity	The address lapsed under Comcast's activity rules	Sign in on the Xfinity Email website and see whether it restores. This is why a local copy matters more for comcast.net than for most providers.

Reader Reported Fixes

Two fixes straight out of Comcast support threads, for when the standard steps stall.

Tick the access box, then wait a minute before retrying. The setting is not always instant. People flip it, see the same rejection immediately and assume it did not help, then remove the account and start over. Give it a minute, quit the mail app fully and reopen it.

Delete the account from the app rather than editing it after the Yahoo upgrade. Changing hostnames in place leaves the old comcast.net entries cached in Outlook and iPhone Mail, which keeps failing against Yahoo. Removing the account and adding it fresh with the Yahoo values and an app password connects first time.

Upgraded to Yahoo Mail? Use These Settings#

Accepting the Yahoo terms keeps your @comcast.net address and moves the mailbox behind it. Your email app has no idea that happened, so it keeps trying comcast.net servers and failing. Swap in these values and it connects again.

The same address, two completely different setups. Which one you need depends on whether you accepted the invitation.

IMAP Server	`imap.mail.yahoo.com`, port `993`, SSL
POP3 Server	`pop.mail.yahoo.com`, port `995`, SSL
SMTP Server	`smtp.mail.yahoo.com`, port `465` or `587`, SSL and authentication required
Username	Your full @comcast.net address, unchanged
Password	A Yahoo app password, created on the Yahoo account security page. Apps that open a Yahoo sign in window can use that instead

Yahoo app passwords behave the opposite way to Google's: Yahoo keeps them working even after you change your main account password and the only way to kill one is to delete it deliberately. Handy and worth a moment of thought about old devices you no longer use.

The 5 things to deal with before you accept the invitation.

What the upgrade moves and what it quietly leaves behind

What	What happens
Your address	Stays @comcast.net
Messages, folders, contacts	Move across with the exceptions below
Mail with attachments over 25 MB	Not moved. Comcast parks it in a separate folder and gives you 30 days to download it
Folders	Up to 4,100 move. Anything beyond that is consolidated. Names over 240 characters get truncated
Contacts	Up to 10,000 move. Contacts beyond that are lost
Folders named like Yahoo system folders	Renamed, so a folder you called Sent will not stay Sent
Forwarding	Stops completely and is not recreated. Rebuild it in Yahoo Mail settings
Filters and other settings	Not retained. Expect to set them up again

The 20 minutes that make this painless. Read that table again as a to do list. Download anything with a big attachment and write your forwarding rules and filters down. Thin out folders if you have thousands. Export contacts if you are near the 10,000 mark. Then accept the upgrade.

Want a copy of everything first? Univik Email Backup saves the whole mailbox to PST, MBOX, EML or PDF using the settings on this page. The 25 MB rule and the folder cap stop mattering once you hold a copy. Moving to a different provider entirely instead? The Univik Email Migration Tool copies every folder into the new account or our Email Migration Services team runs the whole move and verifies it landed.

Use These Settings in Univik Email Backup#

Comcast is the provider where a local copy earns its keep. A 10 GB ceiling, an activity rule that can retire an address and a platform move all landed in the same year. The IMAP settings above are what a backup tool signs in with. Univik Email Backup writes the whole mailbox to PST, MBOX, EML or PDF on your own disk, which outlives quotas, upgrades and cancelled accounts alike.

Get Univik Email Backup running on Windows.
Pick Comcast from the source list. Choose IMAP instead if it is not named there and paste the servers from above.
Sign in with your full @comcast.net address and your Xfinity password, with third party access already switched on.
For manual entry, the tool needs imap.comcast.net on 993 with SSL. Switch on third party access before you run it.
Set the output to PST, MBOX, EML or PDF and pick a destination, then start it. Big mailboxes keep downloading in the background.

Why back up before the Yahoo upgrade: mail carrying attachments over 25 MB is left behind with a 30 day window to rescue it. Folders past 4,100 get merged too. Folders, attachments and dates all survive into files any email app can reopen years later. Moving to a new account instead of archiving? The email migration tool carries the folder tree into the new account instead.

Email Settings Glossary#

IMAP

Internet Message Access Protocol. The protocol behind imap.comcast.net. Comcast holds the mailbox and each connected device shows the same folders and read state.

POP3

Post Office Protocol version 3. The pop3.comcast.net route, SSL only on port 995 now that Comcast retired port 110. Mail lands on 1 machine and leaves the server behind.

SMTP

Simple Mail Transfer Protocol. Sends your outgoing mail. The sending half: smtp.comcast.net on port 587 carries everything outbound while IMAP and POP3 only receive.

SSL / TLS / STARTTLS

Comcast requires SSL on 993 and 995 and TLS on 587. The unencrypted ports are retired, so an app offering 110 or 25 will never connect.

App Password

A generated stand in for your real password, used by apps on providers that issue them. Comcast does not, which is what makes its access switch unusual. Comcast is the exception that proves the rule: no key to generate, just a switch to tick.

OAuth

A sign in window run by the provider instead of a password typed into the app. Comcast does not offer it, which is why the access switch exists here.

How We Verify These Settings#

Comcast has been in Univik software since 2013, first as plain IMAP and now with a platform migration running underneath it. Comcast mailboxes pass through those tools constantly. The Yahoo upgrade pushed that volume higher still. A changed rule reaches our support queue within hours.

Every value here clears 3 checks before it goes live. The first is a working IMAP and SMTP session from Univik Email Backup. We match every line against Comcast's own support articles, plus Yahoo's published settings for upgraded mailboxes. Then we walk the third party access screens exactly as written above. Anything Comcast or Yahoo announces sends us back to the tables, with a scheduled pass every quarter regardless.

Seeing a value that Comcast now shows differently? Tell us and we will retest that week and log the correction in what changed recently.

Help & Support

Comcast Email Settings: FAQ

Use imap.comcast.net on port 993 with SSL and smtp.comcast.net on port 587 with TLS for sending. Sign in with your full @comcast.net address and your Xfinity password. The IMAP settings section carries every value in full.

Because your account is refusing email apps, not your password. Comcast keeps a Third Party Access Security setting that blocks clients at the account level and the resulting error looks exactly like a wrong password. Tick the box in webmail and try again.

No. There is no app password page to find, which is why searching for one wastes so much time. Your Xfinity password is the correct password, paired with the access switch. That changes only after the Yahoo upgrade, where Yahoo app passwords take over.

Your address stays the same, but your servers do not. Swap your app to imap.mail.yahoo.com and smtp.mail.yahoo.com and sign in with a Yahoo app password. Also rebuild forwarding and filters, which Comcast confirms are not carried over. The Yahoo section lists every value and every exception.

IMAP and Comcast says the same. It keeps mail on the server so your phone, laptop and webmail agree. POP still works on pop3.comcast.net port 995, but the old port 110 is retired and POP suits only a single machine.

Yes, if you signed in through the Xfinity Email website during the 90 days before disconnecting. Keeping it afterwards depends on staying active and Comcast describes that window differently across its own pages, so sign in on the website every few months rather than relying on your email app. Keep a local backup as insurance.

Check your storage first. The mailbox holds 10 GB and once it is full Comcast rejects incoming mail while sending carries on working, so nothing in your app looks wrong. The usage meter in webmail confirms it in seconds.

Connect the account over IMAP with a backup tool and pull every folder down in 1 pass. That matters more here than elsewhere: a 10 GB ceiling, activity rules for former customers and the platform move all put comcast.net mail at more risk than most. See the walkthrough.

Use an email migration tool that signs in to both mailboxes over IMAP and copies folder by folder. This page supplies the Comcast side, including the access switch that has to be on before any tool can connect.

Check 4 things in this order, because the cause is rarely your server settings. Sign in at connect.xfinity.com and look at the storage meter first, since a full 10 GB mailbox makes Comcast refuse incoming mail while sending carries on working. Then open the Spam folder. Then check Settings → Mail → Filter Rules, because a rule made years ago can quietly file mail away. Only if webmail itself is missing the messages is it worth suspecting the sender or your email app.

Other Email Provider Settings

Gmail Settings Outlook.com Settings Yahoo Mail Settings AOL Mail Settings iCloud Mail Settings AT&T Settings

Summary: Comcast Settings at a Glance

IMAP: imap.comcast.net, port 993, SSL/TLS
POP3: pop3.comcast.net, port 995, SSL/TLS
SMTP: smtp.comcast.net, port 587 with TLS
Username is your full @comcast.net address

Third party access must be ticked in webmail
Pick IMAP for phone + computer sync
Mailbox limit: 10 GB, then mail bounces
Upgraded to Yahoo? Servers change