AT&T Mail works in any mail app that speaks IMAP. Incoming mail (IMAP): imap.mail.att.net, port 993 (SSL/TLS). Outgoing mail (SMTP): smtp.mail.att.net, port 465 (SSL/TLS). The password is a secure mail key from your AT&T profile, not your AT&T password. In LocalInbox, choose Other IMAP account and type these in under Server settings.
Server settings
| Server | Host name | Port | Security |
|---|---|---|---|
| Incoming (IMAP) | imap.mail.att.net | 993 | SSL/TLS |
| Outgoing (SMTP) | smtp.mail.att.net | 465 | SSL/TLS |
| Incoming (POP3) | inbound.att.net | 995 | SSL/TLS |
For att.net, sbcglobal.net, bellsouth.net, pacbell.net, prodigy.net, swbell.net, ameritech.net, flash.net, nvbell.net, snet.net, wans.net and currently.com addresses.
What the ports and security mean: IMAP ports and SMTP ports.
POP3 is for apps that use it. LocalInbox uses IMAP, so read, moved and deleted mail stays the same on every device: POP3 and IMAP compared.
Steps
- Sign in to your AT&T profile, open the settings for the email address and select Add secure mail key. Name it LocalInbox, select Create and copy the 16-character key.
- In LocalInbox, open Settings › Accounts and click Add Account (or use the welcome screen the first time).
- Choose Other IMAP account. Enter your AT&T address, and a secure mail key from your AT&T profile, not your AT&T password as the password.
- Open Server settings. Under Incoming mail (IMAP), enter imap.mail.att.net and port 993, and choose TLS.
- Under Outgoing mail (SMTP), enter smtp.mail.att.net and port 465, and choose TLS.
- Leave User name empty, and LocalInbox signs in with your full address.
- Click Connect. LocalInbox signs in and starts syncing your mail.
AT&T profile: www.att.com/acctmgmt/myprofile/overview.
Troubleshooting
LocalInbox says the password is wrong
LocalInbox needs a secure mail key from your AT&T profile, not your AT&T password. Copy it again, without spaces before or after.
LocalInbox says it can't connect
The message says what to fix: nothing answering at the port, the wrong kind of TLS for the port, an untrusted certificate, an unknown server name, or a timeout. Check what you typed under Server settings against the table at the top of this page.
Sources
AT&T Mail's settings were checked against its own help pages in November 2026 and can change. The steps in LocalInbox come from the app.
Questions
What are the AT&T Mail IMAP and SMTP settings?
Incoming (IMAP): imap.mail.att.net, port 993, SSL/TLS. Outgoing (SMTP): smtp.mail.att.net, port 465, SSL/TLS. For att.net, sbcglobal.net, bellsouth.net, pacbell.net, prodigy.net, swbell.net, ameritech.net, flash.net, nvbell.net, snet.net, wans.net and currently.com addresses.
Why does AT&T need a secure mail key?
AT&T asks for one in mail apps that don't sign in with its own page (OAuth), in place of your password, for both IMAP and SMTP. Make one for each address and subaccount. Keys don't expire, changing your AT&T password doesn't affect them, and AT&T deletes them if it has to lock your account: then make a new one.
Where does LocalInbox keep the password?
In the macOS Keychain on your Mac. It's never written to a file or sent anywhere except your mail server.
What are the AT&T Mail POP3 settings?
Incoming (POP3): inbound.att.net, port 995, SSL/TLS, for apps that use POP3; outgoing mail goes through the same SMTP server as with IMAP. LocalInbox uses IMAP instead, which keeps read, moved and deleted mail the same in webmail, on your phone and on your Mac. POP3 downloads mail to one device.
Can I add AT&T Mail on iPhone or iPad?
Yes, the same way, in LocalInbox for iPhone and iPad: Settings › Accounts › Add Account, then Other IMAP account. Type in the same server settings and password. Already added it on your Mac? Add Account › From your Mac copies it with a QR code, password included. https://localinbox.app/iphone