On my server I have a mailbox which allows relaying (sending email from any mailbox), and the return mailbox, specified in vBulletin as the webmaster's email does not exists. Thus, all returning email is rejected.
As a new option, you may now specify the return path in the vbulletin email settings (Bounce Email Address). Thus it was made possible to allow bouncing email to be received by a different mail box. I'm not sure since when this option was introduced, but I suspect it was new to 3.7.3; it needs the SMTP settings switched on in order to work.
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