From c6f1af4fffbcf4d737aa28c666fe859f619649a1 Mon Sep 17 00:00:00 2001 From: Trangar Date: Wed, 15 Jul 2020 08:32:38 +0200 Subject: [PATCH] Added information about stealth blocks on port 25 --- docs/content/config/troubleshooting/debugging.md | 10 +++++++++- 1 file changed, 9 insertions(+), 1 deletion(-) diff --git a/docs/content/config/troubleshooting/debugging.md b/docs/content/config/troubleshooting/debugging.md index ade5b38f..102563ed 100644 --- a/docs/content/config/troubleshooting/debugging.md +++ b/docs/content/config/troubleshooting/debugging.md @@ -51,4 +51,12 @@ fail2ban-client set postfix addignoreip # this will delete the jails entirely - nuclear option fail2ban-client stop dovecot fail2ban-client stop postfix -``` \ No newline at end of file +``` + +## 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/) \ No newline at end of file