// troubleshooting guide · hetzner
Hetzner Port 25 Blocked (Can't Send Email)
- Status
- Workaround available
- platforms:
- Linux
- updated:
- November 15, 2026
- reports:
- 4
- Method
- how we research
RUNBOOK · hetzner/port-25-blocked3 FIXES
// quick answer
Hetzner blocks outbound ports 25 and 465 on all cloud servers. Send through an SMTP relay on port 587, or after a month and a paid invoice request an unblock.
Most likely fix: Use port 587 with a relay
How to fix it
// try these in order, the most common fix is first
FIX 1Use port 587 with a relay
- 01Configure Postfix or your app to relay via an email provider on port 587
Did this fix it?FIX 2Request an unblock
- 01Wait until the account is about a month old and the first invoice is paid
- 02In the Console open Request change > limit request
- 03Describe the mail type and volume
Did this fix it?FIX 3Test the block
- 01Run nc -vz smtp.gmail.com 25 (times out if blocked)
Did this fix it?
Symptoms
Mail server or app cannot connect to remote mail servers; telnet to port 25 times out while port 587 works.
Why it happens
- C-01Default anti-spam block on ports 25 and 465
- C-02Account too new for an unblock
- C-03Use case refused (bulk mail)
// this guide also covers
- hetzner port 25 blocked
- hetzner smtp blocked
- hetzner can't send email
- hetzner unblock port 25
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