My mail app can't connect to GMX at all
POP3 and IMAP are off by default. In GMX, go to Settings, POP3 & IMAP, tick the box to turn them on, and save.
GMX Email: Settings, Sign-In & Fixes
GMX keeps POP3 and IMAP switched off until you turn them on, and turns them off again if they go unused. The outgoing server is mail.gmx.com, not smtp.gmx.com.
Covers @gmx.com. Run by GMX. Checked against GMX's own help pages, November 2026.
GMX email server settings
| Server | Address | Port | Security |
|---|---|---|---|
| Incoming (IMAP) | imap.gmx.com | 993 | SSL/TLS |
| Incoming (POP) | pop.gmx.com | 995 | SSL/TLS |
| Outgoing (SMTP) | mail.gmx.com | 587 | STARTTLS |
- Username: Your full email address
- Password: If two-factor authentication is on, create an application-specific password in Security Options and use it in your mail app. It is shown only once.
- Use IMAP if you read mail on more than one device; POP downloads mail to one device only.
Official page: GMX email settings
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Common GMX email problems
It worked before and now it has stopped
GMX switches POP3 and IMAP off by itself if they go unused for a while. Turn them back on in Settings.
My password is rejected and I have two-factor on
Create an application-specific password in Security Options. Copy it straight away, because it is shown only once.
My older mail app shows TLS or security errors
GMX needs TLS 1.2 or newer. Update the mail app, or use a newer one.
Sending fails with smtp.gmx.com
The outgoing server is mail.gmx.com, not smtp.gmx.com.
Problems that look the same on every provider
Can't sign in, or the password stopped working
- Sign in on the provider's own webmail page first. If that works, the problem is your mail app, not the account.
- If webmail rejects the password, use the provider's "Forgot password" page. Never use a reset link from an email you did not ask for.
- Many providers now need a separate app password (or their own sign-in screen) for Outlook, Apple Mail and phone apps. Your normal password will not work there.
Not receiving emails
- Check Spam, Junk and any filters or "blocked senders" in webmail.
- Check whether the mailbox is full; most providers stop accepting mail at the storage limit.
- If your app shows nothing new but webmail does, remove and re-add the account in the app using IMAP.
Can't send, or emails are stuck in the Outbox
- Check the outgoing (SMTP) server, port and security on this page against your app; old guides often list ports that no longer work.
- Turn on "My outgoing server requires authentication" and use the same username and password as incoming.
- Large attachments are a common cause. Remove the attachment and try again.
Contacts are getting spam from my address
- Change the password from webmail, then sign out of all other sessions if the provider offers it.
- Check forwarding rules, filters and the reply-to address in settings; attackers often add a hidden forward.
- Turn on two-step verification, and update the password anywhere else you used the same one.
Setting it up on a new phone or computer
- Use IMAP rather than POP so mail stays in sync across your phone, computer and webmail.
- Enter your full email address as the username unless the provider says otherwise.
- If the app offers the provider by name (Yahoo, Google, Outlook), choose that instead of "Other".
Sources: GMX: IMAP server details · GMX: POP3 server details · GMX: turn on POP3 and IMAP · GMX: application-specific passwords. Providers change settings from time to time; their own page is the final word.
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