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 <client ip>
 # 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