I use K9 Email on Android to access my Rocky mail server. When I connect on my LAN, everything works as expected but if I connect via OpenVPN when travelling, I can read email but not send. Sent emails just sit in the outbox until “failed to send email” message. The K9 server configurations are id…

Best thing to do is take a look in /var/log/maillog for entries at the time you were trying to send the email. The logs should show why, if auth failure, or whatever. This assumes your mail server is built from packages in the Rocky repositories. If a third party mail server like Zimbra or iRedMa…

You could check that you are able to connect to the outgoing SMPT server, e.g. without vpn, and then with vpn. ncat -z -v -w 1 relay.myisp.net 25

Email over VPN issue

Rocky Linux Help & Support

scldad September 1, 2025, 2:14am 4

Turns out to be my fault.

I had forgotten to add my VPN network to my SPF record in my name server.

2 Likes

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Email over VPN issue

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