Solved SMTP Error (corrupt queue file)

[frei]

Hello Cloudron team/patrons,

I was going to ask for help, but we came up with the solution, so we'll pass it forward.

We needed to recover from a system outage, after temporarily running out of disk space. Besides corrupting the certificates (already fixed thanks to the forum here --thank you), we also borked the outgoing SMTP mailserver.

The obvious symptom from RoundCube showed "SMTP Error (-1): Connection to server failed."

Reviewing the 'mail' service logs revealed that there was a corrupted "queue file" (zero bytes), which was crashing the service.

To fix this issue, SSH into the machine, navigate to /home/yellowtent/boxdata/mail, move the haraka-queue to a backup location, and recreate that directory. After that, restart the mail service.

[nebulon]

Glad you managed to fix it up and thanks a lot for sharing the solution here, it will surely help users in the future.

[girish]

For 7.3, it's in the roadmap to expose the mail queue and clear it from the UI.

[scooke]

@frei Excellent sleuthing!