GMX and Mail.com Email Verification
GMX and Mail.com are consumer email services in the same group, popular in Europe. They use @gmx.com, @gmx.net and @mail.com among many free domains.
How GMX and Mail.com Handles Verification
Unlike Gmail and Yahoo, GMX and Mail.com servers usually reject unknown recipients during the SMTP session with a 550 response. This makes mailbox existence verifiable for most of their domains.
What Mailthentic does
We perform a full SMTP handshake and read the RCPT TO response. A clean accept is treated as deliverable, a 550 as invalid, with greylisting retries handled automatically.
Quick Facts
MX Pattern
mx0*.gmx.net / mx0*.mail.com
Catch-All Behavior
Rejects unknown addresses
Typical SMTP Response
550 for unknown recipients (mailbox existence verifiable)
Provider Type
consumer
Common Domains
gmx.com
gmx.net
gmx.de
mail.com
Best Practices for GMX and Mail.com
- SMTP results are usually reliable. A 550 generally means the mailbox does not exist.
- Handle greylisting. Retry after a short delay if the first attempt is deferred.
- Watch rate limits. These servers throttle aggressive senders, so verify at a steady pace.
Other Email Providers
Verify GMX and Mail.com email addresses
Our 9-point verification engine handles GMX and Mail.com's specific behavior automatically. Start free.