[Bug 242383] Re: default postfix config creates backscatter

[Ryan Lortie]

Two more potential (somewhat less good) solutions:

1: You can set 
smtpd_recipient_restrictions = permit_mynetworks, reject_unauth_destination, reject_unknown_recipient_domain

then your host will accept mail for existent-sub.domain.com but not non-
existent-sub.domain.com (this is done by the
reject_unknown_recipient_domain).  Unfortunately, this will accept mail
for any hostname that has an A record, regardless of if an MX is running
there or not.

2: You can use the techniques described here:
http://www.postfix.org/ADDRESS_VERIFICATION_README.html

Unfortunately this uses a lot of resources and might get you blacklisted
by more aggressive mail providers (or rather, mail providers that don't
appreciate your particular variety of aggressiveness).

-- 
default postfix config creates backscatter
https://bugs.launchpad.net/bugs/242383
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