Hello,
I'm asking here if someone has a strategy suggestion for the following scenario:
I'm using courier as the main SMTP server, and another host running Sendmail as a Backup. The backup MX doesn't know about which accounts exist on the courier MySQL DB, and never will; thus it has to accept all the mail for the specified domains. MX. So far, so good.
What happens is that when someone (mainly spammers, who are always the
most informed about mta shortcomings ;)) uses the backup MX for sending to
non-existant accounts, the backup MX accepts them, and routes them to the
courier server, who rejects them. Especially in case of invalid envelope
Senders, the Backup MX postmaster gets spammed with non-delivery messages.
Is there anything I can do to avoid this on the _courier_ side? Ideally, courier would trash messages to invalid recipients originated by the backup MX, leaving the backup MX in peace.
I presume it will be difficult to accomplish, but maybe someone here has dealt with such an issue already and has a smart idea to share...
Thank You very much for reading,
Regards, Lorenzo
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