mail.com SMTP settings: smtp.mail.com, port 587
mail.com outgoing server settings: smtp.mail.com, port 587 STARTTLS or 465 SSL, full address and password; IMAP/SMTP access must be enabled in mail.com settings (same platform as GMX).
mail.com outgoing mail server:
smtp.mail.com, port <code>587</code> (STARTTLS) or <code>465</code> (SSL/TLS), username = your full mail.com address (any of its domains), password = your mail.com password after enabling POP3/IMAP access.
mail.com SMTP settings at a glance
| Outgoing (SMTP) host | smtp.mail.com |
|---|---|
| Ports & encryption |
587 — STARTTLS465 — SSL/TLS |
| Username | your full mail.com address (any of its domains) |
| Password | your mail.com password after enabling POP3/IMAP access |
| Authentication | mail.com and GMX share infrastructure (1&1 Mail & Media): Settings → POP3 & IMAP → enable access. |
How to set up mail.com SMTP
- mail.com → Settings → POP3 & IMAP → enable → Save.
- App settings: host smtp.mail.com, port 587 STARTTLS, username = full address, password = account password.
Sending limits
- Low hourly recipient caps on free accounts; blocks after bursts.
Things that catch people out
- Free accounts may require the paid Premium plan for reliable third-party SMTP.
Common mail.com SMTP errors
| Server reply | Meaning | Fix |
|---|---|---|
535 Authentication credentials invalid | External access not enabled. | Enable POP3/IMAP access in settings. |
More codes: 535 authentication failed, 550 relay denied, 554 rejected as spam, connection timed out — or all SMTP error codes.
When mail.com is not enough for your app
When a provider caps you or blocks a port, point the same app at QueenSMTP instead: host smtp.queensmtp.com, port 587 (STARTTLS) or 465 (SSL), your SMTP username and password from the dashboard. $5/year plus $0.10 per 1,000 emails, 100 free a day to test.
Get SMTP credentials — free to test Test mail.com nowRelated settings
mail.com SMTP — questions
smtp.mail.com on port 587 (STARTTLS) or 465 (SSL), with your full address and password, after enabling POP3/IMAP access.
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