Email Settings GuideQuick answer: au email runs on My au. Every protocol connects to imap.mail.auone.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 My au lets you in. Your exact values also sit under your au mail settings in My au. Auto-setup not working? Read this.
What Changed Recently#
A host changes how you sign in more often than it changes the server names. Here is the current status for au and what it means for your setup.
Worth knowing
The username comes from My au. au gives you a username when you retrieve your mail info. It is not always the plain address, so copy the one it shows.
Worth knowing
au hands you your own settings. There is no single public server list for everyone. Retrieve your IMAP info from My au, since the values are personal to your line.
Worth knowing
ezweb.ne.jp is folding into au.com. New au addresses are @au.com. An @ezweb.ne.jp address keeps working and uses the same retrieval and the same servers.
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 My au and set its password. That password is the one your apps use.
Where: My au then your mail settings
2. Open your au mail settings
Click My au next to the address, then your au mail settings to read the server name and secure ports.
Where: Find your settings →
About au Mail#
au Mail is the email service for a @au.com or @ezweb.ne.jp address, run by KDDI in Japan. It began as phone mail, though it now works in Outlook, Apple Mail and Thunderbird over IMAP.
The catch is that au does not publish one fixed setting for everyone. You retrieve your own IMAP info from My au. The retrieval hands you a server name, a username and a generated password. Those values are personal to your line.
| Service Name | au Mail |
| Run By | KDDI, Japan |
| Address Domains | au.com and ezweb.ne.jp |
| Incoming Server | imap.mail.auone.jp, IMAP |
| Outgoing Server | smtp.mail.auone.jp |
| Ports | IMAP 993, SMTP 465 |
| Username and Password | Retrieved from My au |
| Where to Retrieve | My au, mail settings |
| Some accounts read | imap01.au.com |
au Webmail Login#
You can always read your mail in a browser. The official sign in pages are:
Find Your Settings#
IMAP is ready the moment a mailbox exists, so nothing needs switching on. To read the exact values for one address, au lists them inside My au.
- Log in to My au from your au client area.
- Open your mail settings in the Email section.
- Click My au beside your address, then your au mail settings.
- Pick your app or read the manual settings for the server name and secure ports.
au IMAP Settings#
IMAP is the incoming choice au 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 your au mail settings in My au.
| IMAP Server | imap.mail.auone.jp | |
| Port | 993 | |
| Encryption | SSL/TLS (required) | |
| Username | Your full email address, including @au.com | |
| Password | Your mailbox password | |
| Authentication | Required |
au Mail Uses IMAP#
The settings au hands you are an IMAP bundle. When you retrieve your mail info from My au, it gives an IMAP server, an SMTP server, a username and a password. That is what you enter in a mail app, so your inbox stays on the au server and shows the same on every device.
au SMTP Settings#
SMTP handles outgoing mail. If you can read mail but not send it, the problem is here.
| SMTP Server | smtp.mail.auone.jp | |
| Port (SSL) | 465 | |
| Port (STARTTLS) | 587 | |
| 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. au also supports 587 and 26 if 465 is blocked. Confirm outgoing authentication is on.
Check au IMAP Settings Online#
You don't need to download anything to check au IMAP settings online. This page is the lookup: every value is verified, current and copyable straight from your browser. Not sure your address uses au 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 au webmail, which confirms your address and password work, then confirm an retrieved IMAP password exists. If both pass, any email app connects with the tables above.
Look Up IMAP Settings for Any Email Domain#
This page covers au. 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 My au. A standard au mailbox uses no retrieved IMAP password.
Username is the full address
Type you@au.com in full, with the part after the at sign. au 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 My au, not your au client area login. Reset it there if an app keeps refusing it.
The two factor prompt in the au client area guards billing, not the mailbox connection.
Set Up au 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.auone.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, au address and password, then continue.
- Enter imap.mail.auone.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.auone.jp in both server boxes.
- Leave the secure ports iOS fills, since au 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.auone.jp on 993 over SSL.
- For outgoing use smtp.mail.auone.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, au address and password, then Continue.
- Wait for detection, then make sure IMAP with SSL is picked.
- If detection fails, type imap.mail.auone.jp in yourself.
- Hit Done and the folders fill in on the first sync.
au Webmail Settings#
Server settings connect your apps. The controls here shape how the mailbox acts on its own. They live in the au Mail app on your phone. On a computer they open in a mail app set up with the retrieved IMAP info.
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 My au and give it start and end dates. The au server delivers it, so it fires even when your machine is off.
Filters and Folders
Create filters from the au mail filters in My au. 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
au runs SpamAssassin on incoming mail. Set the threshold and block unwanted senders in My au. Flagged mail lands in the junk folder for a look.
POP3 vs IMAP#
| Feature | IMAP | POP3 |
|---|---|---|
| Where mail lives | On the au 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 |
au Mail at a Glance#
Every value for an au Mail address in one place. Confirm your own server and password in My au:
| Incoming (IMAP) | imap.mail.auone.jp, port 993, SSL |
| Outgoing (SMTP) | smtp.mail.auone.jp, port 465, SSL |
| Outgoing alternative | Port 587 where 465 is blocked |
| Some accounts read | imap01.au.com |
| Username | Retrieved from My au |
| Password | Generated IMAP password from My au |
| Domains | au.com and ezweb.ne.jp |
| First step | Retrieve your mail info in My au |
Troubleshooting au 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 My au, not the client area login. |
| Cannot send on port 25 | ISP blocks the default SMTP port | Switch outgoing to 465 with SSL. au also accepts 587 and 26 if 465 is blocked. |
| I do not know my au server or password | The values are personal and come from My au | Open My au and retrieve your mail info. It shows the IMAP server, the username and a generated password. Copy those into your app rather than guessing. |
| My ezweb.ne.jp address stopped in the app | The retrieved password was re-issued | Re-issuing the IMAP password in My au makes the old one stop working. Fetch the current password from My au and paste it back. The server names stay the same. |
| 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. |
| Auto-setup finished but no mail arrives | The app kept its guessed server | Switch to manual setup and set the incoming server to imap.mail.auone.jp on 993. The app's own guess from the au.com domain does not reach au's mail. |
| The app will not let me change the server | It is still in auto-detect mode | Delete the half-made account, add it again, then choose manual or advanced setup before it detects. Type the retrieved imap.mail.auone.jp and smtp.mail.auone.jp values. |
Reader Reported Fixes
Copy from your au mail settings. When a manual setup will not connect, the your au mail settings page in My au 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.auone.jp with the full address and mailbox password. If webmail works, the credentials are right and the issue sits in the app settings.
The Auto-Filled Server Is Wrong #
When you type an @au.com or @ezweb.ne.jp address into a mail app, it tries to guess the server for you. The guess is wrong. Mail apps read the domain and reach for a matching name, yet au mail does not live at an au.com server. It runs on mail.auone.jp.
So the auto-filled values fail even with the right password. The fix is to pick manual setup, then type in the exact server, username and password you retrieved from My au. In Thunderbird you overwrite the pre-filled server boxes. In Apple Mail and Gmail you add the account by hand rather than letting it detect.
The incoming server is imap.mail.auone.jp on 993 and the outgoing server is smtp.mail.auone.jp on 465, both with SSL. Confirm yours in My au, since some accounts read imap01.au.com. Whatever it shows is the value that works, not the one the app guessed.
| Item | What actually works |
|---|---|
| Incoming server | imap.mail.auone.jp, port 993, SSL |
| Outgoing server | smtp.mail.auone.jp, port 465, SSL |
| Setup mode | Manual, since auto-detect guesses wrong |
| Some accounts read | imap01.au.com |
| Where the values come from | My au retrieval |
Moving Mail In or Out?#
au mail speaks plain IMAP, so a mailbox moves in or out like any My au. 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 au 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 au 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 au 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.auone.jp on port 993 with SSL for au. 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 au mailbox to PST, MBOX, EML or PDF before switching or closing the account.
Email Backup Tool →
Email Migration Tool
Copy every folder from au 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 au server, so every device shows the same inbox. Use imap.mail.auone.jp on port 993 with SSL.
SMTP
Simple Mail Transfer Protocol. Sends your outgoing mail through smtp.mail.auone.jp on port 465 with SSL. Port 587 works where 465 is blocked.
SSL/TLS
Encryption for the connection. au Mail uses it on both servers, port 993 for incoming and port 465 for outgoing.
imap.mail.auone.jp
The incoming server most au accounts use. Confirm your own value in My au, since some accounts read imap01.au.com instead.
smtp.mail.auone.jp
The outgoing server most au accounts use. Confirm your own value in My au, since some accounts read a matching au.com name.
My au
The au account portal at my.au.com. It is where you retrieve your mail info and re-issue the IMAP password.
Retrieved IMAP Password
A password au generates for outside apps. You fetch it from My au. Re-issuing it makes the old one stop working.
IMAP Username
The username au gives you for the server. It comes from the same My au retrieval. It is not always the plain address.
Setup URL
A link My au sends by SMS. Opening it shows your server names, username and password to copy into a mail app.
au.com and ezweb.ne.jp
The two au mail domains. Both use the same retrieval and the same servers, so the steps do not change between them.
au One
The au mail platform behind the auone.jp server names, run by KDDI.
au Mail App
The built-in app on an au phone. On a computer or a non-au phone you set up IMAP with the retrieved info instead.
Auto-Detect
The step where a mail app guesses your servers from the address. For au it guesses wrong, so switch to manual setup.
Manual Setup
The mode where you type the server, username and password yourself. This is how au mail connects, using the values from My au.
mail.auone.jp
The real home of au mail, behind the au.com and ezweb.ne.jp addresses. Your incoming and outgoing servers both sit here.
How We Verify These Settings#
Univik builds email backup, migration and converter software since 2013. Our tools sign in to au 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 au 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 au 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
For incoming mail use imap.mail.auone.jp on port 993 with SSL. For outgoing use smtp.mail.auone.jp on port 465 with SSL. The username and password come from My au, so retrieve them first. Some accounts read imap01.au.com instead.
au Mail does not use your au ID password in a mail app. It uses a separate IMAP password that au generates. Retrieve it from My au. Remember that re-issuing it makes the old one stop working.
From My au. Open the mail settings, then fetch your info. au can send a setup link by SMS that shows the server names, the username and the password. Copy those into your mail app. A tip is to do this on the au line with Wi-Fi off.
The server names and ports are the same everywhere, imap.mail.auone.jp for incoming and smtp.mail.auone.jp for outgoing. Only the username and password differ per account, since you retrieve those from My au. The menu wording differs between apps.
Yes. Both au mail domains use the same retrieval and the same servers. New addresses are @au.com, though an @ezweb.ne.jp address keeps working with no change to the server names or ports.
Yes. au Mail supports IMAP and SMTP over encrypted connections, which is what these apps use. Keep SSL on for incoming and use port 465 for outgoing. Where 465 is blocked, switch to 587.
Add the account over IMAP so the folders sync, then let the app finish downloading. In Thunderbird or Outlook you can then export a folder to a local file. IMAP leaves the originals on the au server while you copy.
The usual cause is a re-issued IMAP password, which turns the old one off. Retrieve the current password from My au and paste it back. If the server was wrong, check whether your account reads imap.mail.auone.jp or imap01.au.com.
Yes, through au mail persistence. You can carry an @au.com or @ezweb.ne.jp address on for a monthly fee after moving to another carrier. You still retrieve the settings from My au. The servers stay imap.mail.auone.jp and smtp.mail.auone.jp.
The app guessed the server from your au.com or ezweb.ne.jp address. That guess does not match au's real servers. au mail runs on mail.auone.jp. Delete the account, add it again with manual setup, then enter imap.mail.auone.jp for incoming and smtp.mail.auone.jp for outgoing, along with the username and password from My au. Some accounts read imap01.au.com, so confirm yours. The section above walks through it.
Other Email Provider Settings
Summary: au Settings at a Glance
- IMAP: imap.mail.auone.jp, port 993, SSL/TLS
- POP3: imap.mail.auone.jp, port 995, SSL/TLS
- SMTP: smtp.mail.auone.jp, port 465 or 587
- Username is always your full email address
- au mailbox on the au servers
- Pick IMAP for phone + computer sync
- Full address as the username
- Username is always the full email address