XF 1.2 Mail Error


Well-known member
Its most likely an add-on that is trying to send mail using the deferred system, but doesn't format it properly.


Well-known member
These are the add ons installed on the site which it is happening on. Any suggestions:


Adam Howard

Well-known member
I saw this error on someone else's site and unchecking the follow box solved it

AdminCP > Options > Email Options

Set return path with -f parameter (recommended, but does not work on all servers)

Uncheck it, save.