Change in alias/distribution list target handling


Up until now, if you had an alias, virtual alias or distribution list with multiple targets, and one of those targets was a FastMail address that didn't exist as an alias/username, then that address would be silently ignored.

For instance, say you have a domain with an alias "" that targets " ,". And say you have an alias for "", but no alias for "". Previously this would have worked without any error, with email sent to going to only, and the target being ignored because it wasn't a valid address.

Now however, sending an email to will deliver the email to, but will also generate a bounce message back to the sender, explaining that the email couldn't be delivered to, one of the targets of the alias.