GMX Mail Login and Sending Problems
Missing incoming mail instead? See our guide on GMX Mail not receiving emails. This one's about signing in and sending.
1. Can't sign in
- Confirm you're using your full address, including whichever domain you picked at signup — GMX offers several, and mixing them up is an easy mistake to make.
- Use password recovery instead of retrying repeatedly, which can trigger a temporary lock.
- Try a private window if the login page itself seems stuck.
If signing in keeps redirecting you straight to GMX's Help Center page instead of loading your inbox, that's a specific, recognized pattern many users report rather than something wrong with your particular account — clearing cookies for gmx.com and retrying sometimes clears it, but if it persists across multiple attempts and devices, it may be a wider issue on GMX's side rather than anything fixable through your own settings.
2. Third-party app won't sign in
GMX requires POP3/IMAP access to be explicitly turned on before third-party apps can connect at all.
- Sign in to GMX Mail on the web.
- Settings → POP3 & IMAP → confirm the protocol your app uses is enabled.
- Two-factor on? Generate an app-specific password rather than using your normal one.
If a third-party app (Outlook, Thunderbird, or another mail client) that used to connect fine suddenly starts rejecting your password with an authentication error, even though webmail itself still works — that's consistent with GMX periodically tightening its login requirements for POP3/IMAP/SMTP access. An app-specific password is the fix in almost every case I've seen reported; your regular GMX password quietly stops being accepted for these connections even without 2FA changing on your end.
3. Emails stuck in the Outbox or rejected
- Check for an oversized attachment — GMX's limit runs smaller than a lot of other providers.
- Third-party app? Confirm outgoing settings:
mail.gmx.com, port 587 or 465, authentication required.
4. Account flagged or sending restricted
Free webmail accounts sometimes get temporary sending limits after unusual activity or high volume, as an anti-spam measure. If sending suddenly stops with no clear error, waiting a few hours is often the actual fix, not a settings change.