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Added information about stealth blocks on port 25

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Trangar 2020-07-15 08:32:38 +02:00
parent 68e9e5dd36
commit c6f1af4fff
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docs/content/config/troubleshooting/debugging.md
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@ -51,4 +51,12 @@ fail2ban-client set postfix addignoreip <client ip>
# this will delete the jails entirely - nuclear option
fail2ban-client stop dovecot
fail2ban-client stop postfix
```
```
## Send email is never received
Some hosting provides have a stealth block on port 25. Make sure to check with your hosting provider that traffic on port 25 is allowed
Common hosting providers known to have this issue:
- [Azure](https://docs.microsoft.com/en-us/azure/virtual-network/troubleshoot-outbound-smtp-connectivity)
- [AWS EC2](https://aws.amazon.com/premiumsupport/knowledge-center/ec2-port-25-throttle/)