[Workaround.org] Preventing backscatter with Postfix
workaround-ml at lugh.ch
Fri Jul 30 10:06:42 CEST 2010
Recently my mailserver got re-listed at backscatterer.org, an RBL run
by the infamous UCEPROTECT guy(s).
I read http://www.postfix.org/LOCAL_RECIPIENT_README.html#change and
so I added this to my main.cf:
local_recipient_maps = $virtual_mailbox_maps
So if I query this map with postmap -q i get "1" back if the user
exists, but nothing if it's missing. At the end of that URL above is a
"NOTE: a lookup table should always return a result when the address
exists, and should always return "not found" when the address does not
exist. In particular, a zero-length result does not count as a "not
Might this be the problem? I'd simply like to prevent spoofed DSNs. It
doesn't seem to work like this.
I don't think amavis is the problem, my configuration is as follows:
# grep -r final_*_ /etc/amavis/
/etc/amavis/conf.d/50-user:$final_spam_destiny = D_PASS;
D_DISCARD; # (data not lost, see virus quarantine)
D_BOUNCE; # D_REJECT when front-end MTA
/etc/amavis/conf.d/20-debian_defaults:$final_spam_destiny = D_PASS;
D_PASS; # False-positive prone (for spam)
Thanks in advance.
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