Xcode Server failing to send mails after update to Big Sur

Basically no mails will be sent after integrations - the only thing I've been able to find in the console that seems like it would be related is this message from kernel:

Sandbox: node(75477) deny(1) network-outbound*:25

The smtp that is setup works fine when accessed from Mail on the same computer

buildService.log for an integration indicates that triggers have been run and does not list any errors

Apart from the update to macOS 11.1 (from 10.15.x) Xcode was also updated to 12.3
I've been battling with this issue too. I have more information over at stackoverflow

I think i've narrowed it down to a permission issue which can't be fixed as in Big Sur the root is read only.

I've found that Xcode post scripts can in fact run postman directly, so I will be posting an update later with how I got it working using postman directly.
Xcode Server failing to send mails after update to Big Sur
 
 
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