Mike Batchelor wrote:
> I want to reject mail for domains that resolve to 127.0.0.1 or that
> have MX records with hostnames that resolve to 127.0.0.1
? Do you mean you have relay_based_on_MX turned on and email to these domains is being
accepted? Solution: turn off relay_based_on_MX.
Or do you mean you are accepting MAIL FROM: bad.example.com, and bad.example.com has
MX 127.0.01?
If so, some kind of verify-sender algorithm could help. When you get
MAIL FROM: [EMAIL PROTECTED]
connect to the mail servers of example.com and try to
MAIL FROM: <>
RCPT TO: [EMAIL PROTECTED]
If this is rejected, then you in turn reject the MAIL FROM: with a 5xx Sorry, if
[EMAIL PROTECTED] doesn't want to receive mail from <>, I don't want mail from him.
The theory goes that if bad.example.com goes to 127.0.0.1, then your test of RCPT TO:
[EMAIL PROTECTED] will be against localhost - and localhost should certainly deny this
as it would be an open relay otherwise.
[EMAIL PROTECTED] 805.964.4554 x902
Hispanic Business Inc./HireDiversity.com Software Engineer
perl -e"map{y/a-z/l-za-k/;print}shift" "Jjhi pcdiwtg Ptga wprztg,"
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