Email Settings GuideQuick answer: Yahoo! JAPAN email runs on Yahoo! JAPAN. Every protocol connects to imap.mail.yahoo.co.jp. IMAP is on 993, POP3 on 995 and SMTP on 465, each secured with SSL. Your username is the full address and the mailbox password you set in Yahoo! JAPAN settings lets you in. Your exact values also sit under Client Access Limits in Yahoo! JAPAN settings. Sending on port 587 with no luck? 587 was retired here.
What Changed Recently#
A host changes how you sign in more often than it changes the server names. Here is the current status for Yahoo! JAPAN and what it means for your setup.
Worth knowing
Access from abroad is being blocked. Yahoo! JAPAN is switching an overseas access restriction on by default, so a third-party client outside Japan stops working until you set the restriction off.
Worth knowing
Client access is set off by preference. Yahoo! JAPAN now suggests leaving IMAP/POP/SMTP access off and using its own apps, so you set access to allow before a client connects.
Worth knowing
The plain ports were retired. Yahoo! JAPAN ended the unencrypted ports in 2021, so a client uses 993, 995 and 465 with SSL. Port 587 is no longer offered.
Before You Begin#
Handle these two basics before anything else. Skip them and your email app will reject the connection even when every server value is correct.
1. Create the mailbox
Add the address under your mail settings in Yahoo! JAPAN settings and set its password. That password is the one your apps use.
Where: Yahoo! JAPAN then your mail settings
2. Open the client-access limits
Click the overseas restriction next to the address, then the client-access limits to read the server name and secure ports.
Where: Client Access Limits
About Yahoo! JAPAN Mail#
Yahoo! JAPAN Mail is the mail of Yahoo! JAPAN, a top web portal in Japan. It is a separate service from Yahoo.com, on its own servers. A mailbox carries a yahoo.co.jp address and reads at mail.yahoo.co.jp. It works in Outlook, Apple Mail or Thunderbird once you allow client access.
Incoming mail uses imap.mail.yahoo.co.jp on 993 with SSL. Outgoing uses smtp.mail.yahoo.co.jp on 465 with SSL. The parts that trip people are the access controls. Yahoo! JAPAN keeps IMAP/POP/SMTP access off by preference and is switching an overseas restriction on, so a client needs both set the right way before it connects.
| Service Name | Yahoo! JAPAN Mail, free webmail |
| Run By | LY Corporation, Japan |
| Address Domain | yahoo.co.jp (separate from Yahoo.com) |
| Incoming Server | imap.mail.yahoo.co.jp 993 (POP pop.mail.yahoo.co.jp 995) |
| Outgoing Server | smtp.mail.yahoo.co.jp, port 465 SSL |
| Client Access | Allow IMAP/POP/SMTP, overseas restriction off |
| Webmail | mail.yahoo.co.jp |
Yahoo! JAPAN Webmail Login#
You can always read your mail in a browser. The official sign in pages are:
Webmail
Yahoo! JAPAN Webmail
Yahoo! JAPAN Help
Yahoo! JAPAN Limits Third-Party Apps#
Yahoo! JAPAN is tightening how third-party mail apps reach a yahoo.co.jp mailbox, to cut down on account takeovers. Two settings decide whether Outlook, Apple Mail or a phone app can connect. For a client to work you set the first to allow and the second to off.
| Setting | For a client, set it to |
|---|---|
| IMAP/POP/SMTP access | Allow (Yahoo! JAPAN suggests off) |
| Overseas access restriction | Off (Yahoo! JAPAN is turning it on) |
| Password, with two-step on | An app password |
Yahoo! JAPAN IMAP Settings#
IMAP is the incoming choice Yahoo! JAPAN points most people to. Mail stays put on the server, so a laptop and a phone read one shared inbox. Pull the exact server name from the client-access limits in Yahoo! JAPAN settings.
| IMAP Server | imap.mail.yahoo.co.jp | |
| Port | 993 | |
| Encryption | SSL/TLS (required) | |
| Username | Your full email address, including @yahoo.co.jp | |
| Password | Your mailbox password | |
| Authentication | Required |
Yahoo! JAPAN POP3 Settings#
POP3 downloads mail to 1 device. Pick it only if you want a local copy on a single computer. Not sure? See the comparison below.
| POP3 Server | pop.mail.yahoo.co.jp | |
| Port | 995 | |
| Encryption | SSL/TLS (required) | |
| Username | Your full email address | |
| Password | Your mailbox password |
Yahoo! JAPAN SMTP Settings#
SMTP handles outgoing mail. If you can read mail but not send it, the problem is here.
| SMTP Server | smtp.mail.yahoo.co.jp | |
| Port (SSL) | 465 | |
| Encryption | SSL or STARTTLS (required) | |
| Username | Your full email address | |
| Password | Same as incoming mail | |
| Authentication | Required. Switch on outgoing server authentication in the client. |
465 with SSL. Many home connections block port 25. Confirm outgoing authentication is on.
Check Yahoo! JAPAN IMAP Settings Online#
You don't need to download anything to check Yahoo! JAPAN IMAP settings online. This page is the lookup: every value is verified, current and copyable straight from your browser. Not sure your address uses Yahoo! JAPAN servers? Type it below and find out instantly.
Does my email address use these settings?
Runs in your browser only. Your address is never sent anywhere or stored.
Want to verify the account itself before configuring an app? Sign in at Yahoo! JAPAN webmail, which confirms your address and password work, then confirm an app password exists. If both pass, any email app connects with the tables above.
Look Up IMAP Settings for Any Email Domain#
This page covers Yahoo! JAPAN. For every other address, work email on a company domain included, we run a free online lookup database: imapsettings.com.
imapsettings.com
Complete email settings database, by Univik
Enter any email address and get the incoming and outgoing server settings for that domain in 1 step:
Your address is used only to find the settings for that domain. Nothing is stored or shared.
Username and Password#
Both come from the mailbox itself. The username is the whole email address and the password is the one you chose when you built the address in Yahoo! JAPAN settings. A standard Yahoo! JAPAN mailbox uses no app password.
Username is the full address
Type you@yahoo.co.jp in full, with the part after the at sign. Yahoo! JAPAN turns down a bare mailbox name.
Put that same address on both incoming and outgoing.
Password is the mailbox one
This is the webmail password you set under your mail settings in Yahoo! JAPAN settings, not your Yahoo! JAPAN client area login. Reset it there if an app keeps refusing it.
The two factor prompt in the Yahoo! JAPAN client area guards billing, not the mailbox connection.
Set Up Yahoo! JAPAN in Email Clients#
The servers and ports are always the same. Only the menus differ. Jump to your app:
Outlook (Windows and Mac)
- In Outlook select Add Account, then turn on manual setup under Advanced options.
- Choose IMAP and set incoming to
imap.mail.yahoo.co.jpon 993 with SSL. - Set outgoing to the same server on 465 with SSL.
- Enter the full address and mailbox password when Outlook prompts you.
- Send a test message to yourself to prove both paths.
Apple Mail (macOS)
- In Mail select Add Account, then pick Other Mail Account.
- Give your name, Yahoo! JAPAN address and password, then continue.
- Enter imap.mail.yahoo.co.jp with SSL on incoming and outgoing.
- Keep the SSL ports so nothing sends in plain text.
- Save and wait for the mailbox to load.
iPhone and iPad
- In Settings open Mail, then tap Mail Accounts and Add Account.
- Tap Other then Add Mail Account and fill your details.
- Keep IMAP chosen and put imap.mail.yahoo.co.jp in both server boxes.
- Leave the secure ports iOS fills, since Yahoo! JAPAN expects SSL.
- Tap Save and let iOS run its check.
Android
- Open your mail app and tap Add account, then Other or IMAP.
- Put in your address and password. Switch to manual setup if it stalls.
- For incoming use imap.mail.yahoo.co.jp on 993 over SSL.
- For outgoing use smtp.mail.yahoo.co.jp on 465 over SSL.
- Save and swipe down to fetch your mail.
Thunderbird
- In Thunderbird pick Account Actions, then Add Mail Account.
- Type your name, Yahoo! JAPAN address and password, then Continue.
- Wait for detection, then make sure IMAP with SSL is picked.
- If detection fails, type imap.mail.yahoo.co.jp in yourself.
- Hit Done and the folders fill in on the first sync.
Yahoo! JAPAN Webmail Settings#
Server settings connect your apps. The controls here shape how the mailbox acts on its own. They live in Yahoo! JAPAN webmail, opened at mail.yahoo.co.jp in any browser.
Signature
Add one in the webmail preferences. It rides on mail sent from webmail. A desktop app keeps a signature of its own.
Vacation Auto Reply
Set an autoresponder in Yahoo! JAPAN settings and give it start and end dates. The Yahoo! JAPAN server delivers it, so it fires even when your machine is off.
Filters and Folders
Create filters from the Yahoo! JAPAN webmail filters in Yahoo! JAPAN settings. A server side rule sorts a message ahead of any device fetching it. A rule set inside an app only works while that app is running.
Spam and Blocked Senders
Yahoo! JAPAN runs SpamAssassin on incoming mail. Set the threshold and block unwanted senders in Yahoo! JAPAN settings. Flagged mail lands in the junk folder for a look.
POP3 vs IMAP#
| Feature | IMAP | POP3 |
|---|---|---|
| Where mail lives | On the Yahoo! JAPAN server | Downloaded to 1 device |
| 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 |
Yahoo! JAPAN Mail at a Glance#
Every value for a yahoo.co.jp address in one place. Two access settings decide whether a client connects:
| Incoming (IMAP) | imap.mail.yahoo.co.jp, port 993, SSL |
| Incoming (POP3) | pop.mail.yahoo.co.jp, port 995, SSL |
| Outgoing (SMTP) | smtp.mail.yahoo.co.jp, port 465, SSL |
| IMAP/POP/SMTP access | Set to allow |
| Overseas restriction | Set to off for a client |
| Password (two-step on) | An app password |
| Webmail | mail.yahoo.co.jp |
Troubleshooting Yahoo! JAPAN Connections#
Find the exact error your email app shows, then apply the fix:
| Error you see | What it means | Fix |
|---|---|---|
| Username or password rejected | Short username or wrong password | Use the full email address with the mailbox password from Yahoo! JAPAN, not the client area login. |
| Cannot send on port 25 | ISP blocks the default SMTP port | Switch outgoing to 465 with SSL. |
| Client stopped, password says wrong | Access setting changed by the anti-fraud rollout | Open mail.yahoo.co.jp settings, set IMAP/POP/SMTP access to allow and the overseas restriction to off. With two-step verification on, generate a fresh app password and enter that. |
| Works at home, fails on a trip | Overseas access restriction blocked the client | The overseas restriction blocks a client from outside Japan. Turn it off in mail.yahoo.co.jp settings. The official Yahoo! JAPAN app works while travelling. |
| Cannot connect to server | Wrong port or encryption | Set 993 with SSL incoming and 465 with SSL outgoing. A firewall on your own machine can block it as well. |
| Repeated password prompt | Short username or a typo | Clear the saved login, then put in the full address with the mailbox password. |
| Messages stuck in Outbox | SMTP authentication is off | Enable "outgoing server requires authentication" with the same login as incoming mail. |
| Sending fails on port 587 | 587 was retired on Yahoo! JAPAN | Yahoo! JAPAN ended 587 with the other plain ports in 2021. Set the outgoing server to smtp.mail.yahoo.co.jp on 465 with SSL, since that is the only outgoing port left. |
| STARTTLS submission will not connect | No 587 to upgrade on Yahoo! JAPAN | STARTTLS normally runs on 587, which Yahoo! JAPAN no longer offers. Switch the outgoing connection to straight SSL on 465 rather than STARTTLS. |
Reader Reported Fixes
Copy from the client-access limits. When a manual setup will not connect, the the client-access limits page in Yahoo! JAPAN settings prints the exact server name and ports for that mailbox. Pasting those in clears the guesswork behind most failed setups.
Test the login in webmail first. Sign in at webimap.mail.yahoo.co.jp with the full address and mailbox password. If webmail works, the credentials are right and the issue sits in the app settings.
Why Port 587 Does Not Work Here#
On almost every other mail service, 587 is the go-to port for sending. On Yahoo! JAPAN it does nothing. People add 587 out of habit, the send fails, then the settings look right otherwise. The reason is a change Yahoo! JAPAN made years ago.
On 19 January 2021 Yahoo! JAPAN ended its unencrypted authentication methods. On Yahoo! JAPAN, 587 was a plain outgoing port sitting next to 25, not the encrypted submission port it is elsewhere. When Yahoo! JAPAN retired the plain ports it took 110, 25 and 587 together, so 465 with SSL is the one outgoing port left. Setting a client to 587 points it at a port Yahoo! JAPAN no longer answers.
| Port | On Yahoo! JAPAN |
|---|---|
| 465 (SSL) | The one outgoing port, use this |
| 587 | Retired in 2021, was a plain port here |
| 25 | Retired in 2021, plain outgoing |
| 110 | Retired in 2021, plain POP |
Moving Mail In or Out?#
Yahoo! JAPAN mail speaks plain IMAP, so a mailbox moves in or out like any Yahoo! JAPAN account. Each folder stays on the server until the move finishes.
Take a copy first. Back up the mailbox before a move. A note that arrives mid switch can sit on either side. A copy keeps you safe.
Carrying mail across? The Univik Email Migration Tool moves each folder over an IMAP link. Give it the Yahoo! JAPAN server name and mailbox password on this side and the other account opposite.
Rather hand it off? Our Email Migration Services team runs the whole move and verifies each folder arrived.
Use These Settings in Univik Email Backup#
The same IMAP settings above let you download your complete Yahoo! JAPAN mailbox to your computer. Univik Email Backup saves everything as PST, MBOX, EML or PDF files you keep forever, even if the account closes.
- Download Univik Email Backup and install it on Windows.
- Select Yahoo! JAPAN from the source list. If it isn't listed by name, choose IMAP.
- Give the complete email address with your mailbox password. The login name is always the whole email address.
- When the backup tool wants server details, hand it imap.mail.yahoo.co.jp on port 993 with SSL for Yahoo! JAPAN. Take those values straight from the IMAP table above, with port
993over SSL. - Pick a saving format and folder, then start the backup. Large mailboxes download in the background.
Univik Tools That Use These Settings#
Many people land here while migrating or archiving a mailbox. All 3 tools use the same IMAP settings from this page:
Email Backup
Download your complete Yahoo! JAPAN mailbox to PST, MBOX, EML or PDF before switching or closing the account.
Email Backup Tool →
Email Migration Tool
Copy every folder from Yahoo! JAPAN straight into Gmail, Microsoft 365 or any other account. No manual export needed.
Email Migration Tool →
Email Converter Tool
Already have MBOX, EML or OST files from an old export? Convert them to PST, PDF or any format your new app opens.
Email Converter Tool →Prefer to hand the whole migration to experts?
If the hostnames and passwords feel like busywork, you can let the tool handle it. Univik's migration team handles the complete project: planning, transfer, verification and a report showing every folder made it. Since 2013, for single mailboxes up to full company moves.
Email Settings Glossary#
IMAP
Internet Message Access Protocol. Reads mail that stays on the Yahoo! JAPAN server, so every device shows the same inbox. Use imap.mail.yahoo.co.jp on port 993 with SSL.
POP3
Post Office Protocol version 3. Downloads mail to one device. Use pop.mail.yahoo.co.jp on port 995 with SSL if you prefer POP.
SMTP
Simple Mail Transfer Protocol. Sends your outgoing mail through smtp.mail.yahoo.co.jp on port 465 with SSL. Yahoo! JAPAN keeps 465 as the one outgoing port.
SSL and TLS
The encryption Yahoo! JAPAN requires on 993, 995 and 465. The older plain ports are gone, so a client has to use these secure ones.
IMAP/POP/SMTP Access
The switch in Yahoo! JAPAN settings that lets a third-party app connect. Yahoo! JAPAN now suggests leaving it off, so you set it to allow before a client works.
Overseas Access Restriction
A Yahoo! JAPAN setting that blocks client access from outside Japan. Yahoo! JAPAN is turning it on by default, so a client abroad has to have it set off.
App Password
A code you generate when two-step verification is on, typed in place of your password. Yahoo! JAPAN creates it in the account settings for a mail client to use.
Full Email Address
Your username for the server is the whole address, like you@yahoo.co.jp. Type it in full on both the incoming and the outgoing server.
Yahoo! JAPAN Webmail
The browser view of your mail at mail.yahoo.co.jp. This is where you allow client access and set the overseas restriction.
Official Apps
The Yahoo! JAPAN Mail apps for iPhone, iPad and Android. Yahoo! JAPAN points people to these rather than a third-party client, for anti-fraud reasons.
Port 465
The only SMTP port on Yahoo! JAPAN. Port 587 was retired with the other plain ports, so 465 with SSL is the one to use for sending.
Yahoo! JAPAN Mail
The mail of Yahoo! JAPAN, a separate service from Yahoo.com. Addresses end in yahoo.co.jp and read at mail.yahoo.co.jp.
Port 587
Elsewhere the encrypted submission port, but on Yahoo! JAPAN a plain port that was retired in 2021. Adding it to a client sends nowhere, so use 465 with SSL instead.
Plaintext Ports
The unencrypted ports 110, 25 and 587 that Yahoo! JAPAN offered once. All three ended on 19 January 2021, which is why only the SSL ports work now.
STARTTLS
A method that upgrades a plain connection, usually on 587. Yahoo! JAPAN has no 587 to upgrade, so sending goes over straight SSL on 465 instead.
How We Verify These Settings#
Univik builds email backup, migration and converter software since 2013. Our tools sign in to Yahoo! JAPAN over IMAP and SMTP every day for thousands of users, so a changed server, port or login rule shows up in our connection logs before most guides notice it.
Every value on this page is confirmed with three checks: a live IMAP and SMTP connection from Univik Email Backup, a comparison against the Yahoo! JAPAN guides and a sign in with a real mailbox using the full address. We re verify after any provider announcement and at least once a quarter.
Found something that no longer matches what Yahoo! JAPAN shows you? Tell us and we will retest and update the page, with the change logged in what changed recently.
Help & Support
Frequently Asked Questions
Incoming is imap.mail.yahoo.co.jp on port 993 with SSL. For POP the host is pop.mail.yahoo.co.jp on port 995. Outgoing is smtp.mail.yahoo.co.jp on port 465 with SSL. The username is your full yahoo.co.jp address.
Yahoo! JAPAN is rolling out anti-fraud settings that break third-party clients. Open mail.yahoo.co.jp settings, set IMAP/POP/SMTP access to allow, then set the overseas restriction to off. With two-step verification on, generate a fresh app password and enter that.
Sign in at mail.yahoo.co.jp, open Settings, go to the IMAP/POP/SMTP access item, then set it to allow. Yahoo! JAPAN leaves this off by preference now, so a client cannot connect until you switch it on.
A Yahoo! JAPAN security setting that blocks a third-party client from outside Japan. Yahoo! JAPAN is switching it on by default, so a client abroad fails until you set it off. A connection judged as overseas is blocked even inside Japan, which a VPN can trigger.
Only if two-step verification is on. In that case your ordinary password is refused in a client, so you generate an app password in the Yahoo! JAPAN account settings and use that. Without two-step, your normal password works once access is allowed.
Your username is the full address, like you@yahoo.co.jp. Type the whole thing on both the incoming and the outgoing server. The password is your Yahoo! JAPAN password (or an app password when two-step is on).
Send through smtp.mail.yahoo.co.jp on port 465 with SSL. Port 587 is not offered here, since Yahoo! JAPAN retired the plain ports in 2021. Turn outgoing authentication on with the same login as incoming.
No. Yahoo! JAPAN Mail is a separate service on its own servers, with yahoo.co.jp addresses. A Yahoo.com address uses different servers, so do not mix the two sets of settings.
Open mail.yahoo.co.jp and sign in with your Yahoo! JAPAN ID. Webmail is the quickest way to check mail without a client. It is also where you set the access and overseas options.
Because Yahoo! JAPAN retired it. On 19 January 2021 it ended the unencrypted ports. On Yahoo! JAPAN 587 was a plain outgoing port next to 25, not the encrypted one it is elsewhere. All three plain ports went, so 465 with SSL is the only outgoing port now. A client set to 587 points at a port that no longer answers.
Other Email Provider Settings
Summary: Yahoo! JAPAN Settings at a Glance
- IMAP: imap.mail.yahoo.co.jp, port 993, SSL/TLS
- POP3: imap.mail.yahoo.co.jp, port 995, SSL/TLS
- SMTP: smtp.mail.yahoo.co.jp, port 465
- Username is always your full email address
- Yahoo! JAPAN mailbox on the Yahoo! JAPAN servers
- Pick IMAP for phone + computer sync
- Full address as the username
- Username is always the full email address