IMAP settings · t-online.de · magenta.de
T-Online IMAP settings
T-Online is the mail service of German Telekom, and its defining quirk is the password. The one you sign in to your Telekom account with is not accepted over IMAP: external programs need a separate "password for email programs", and it has to be created in the mail settings first.
IMAP connection
- Server
- secureimap.t-online.de
- Port
- 993
- Encryption
- SSL/TLS
- Username
- full address
- Password
- app password
Sending, SMTP
- Server
- securesmtp.t-online.de
- Port
- 465
- Encryption
- SSL/TLS
Checked against the service's own autoconfiguration file on 2026-09-15 — the same source Thunderbird reads when it fills the settings in for you. Source: autoconfig.thunderbird.net, www.telekom.de
What breaks here.
- The Telekom account password does not work over IMAP. A separate "Passwort für E-Mail-Programme" is created in the mail centre, and that is what the client takes.
- Telekom explicitly advises making it different from the account password: this one lives inside mail programs, which means it is stored on devices.
- The hosts carry the secure prefix: secureimap.t-online.de in, securesmtp.t-online.de out. There are no unencrypted variants.
- The username is the full address, @t-online.de or @magenta.de included.
Questions
The short answers
Where is the email-program password created?
In the T-Online mail centre: the gear icon → show all settings → account details → the passwords section → password for email programs. If none exists yet, you create it there.
Why is my website password refused?
By design: access for external programs is separated from the account login, so the account password does not end up spread across devices.
Which ports and encryption?
IMAP 993 with SSL/TLS, SMTP 465 with SSL/TLS (port 587 with STARTTLS is accepted as well).
Can I migrate a T-Online mailbox elsewhere?
Yes. Use secureimap.t-online.de as the source with the email-program password; messages, folders and dates transfer, and nothing changes at T-Online.
Find out how big your mailbox is. It costs nothing.
Connect two servers, look at the size and decide. Or take the client and keep everything on your side.
Code on GitHub · built on imapsync · no sign-up