I can send and receive email just fine with my Yunohost install on a VPS. The trouble is that email sent to an alias, doesn’t seem to come through. Most of the time there’s no visible error, although a couple of times when I sent a mail from a temp Proton account, an email has bounced back with the following error:
[root@mydomain.tld](root@mydomain.tld)>:
host [mx1.hostsdomain.tld](http://mx1.hostsdomain.tld)[IP address] said:
550 relay not permitted (in reply to RCPT TO command)
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message/delivery-status
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Reporting-MTA: dns; [mail-40135.protonmail.ch](http://mail-40135.protonmail.ch) X-Postfix-Queue-ID: 4Lf8cB3xhGz4wxFX X-Postfix-Sender: rfc822; [myprotonemail@protonmail.com](myprotonemail@protonmail.com)
Arrival-Date: Thu, 7 Jul 2022 21:26:34 +0000 (UTC) Final-Recipient: rfc822; [root@mydomain.tld](mailto:root@mydomain.tld) Original-Recipient: [rfc822;root@mydomain.tld](mailto:rfc822;root@mydomain.tld)
Action: failed
Status: 5.0.0 Remote-MTA: dns; [mx1.myhost.tld](http://.mx1myhost.tld)
Diagnostic-Code: smtp; 550 relay not permitted
I’ve changed my domain names. As far as I’m aware, I’m not using an email relay service.