Quote:
Originally Posted by walesrob
...How would I go about creating bounce rules in Fastmail? More importantly, in my many years of emailing, I often read not to create bounce notices for unknown aliases as it creates more problems...
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In your Virtual Aliases table, create an alias which targets that same alias. In other words, if the alias is bad@yourdomain, use the target bad@yourdomain for that alias. This won't create an infinite loop, but will instead return this error to the sending system:
Quote:
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550 5.1.1 <bad@yourdomain>: Recipient address rejected: User unknown in local recipient table
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This is a "mailbox does not exist" delivery error returned to the actual sending system, which is different from a "bounce" reply to the From address (which may be spoofed).
Bill