Date: Wed, 4 Jan 2017 17:46:25 -0800 From: Doug Hardie <bc979@lafn.org> To: "freebsd-questions@freebsd.org Questions" <freebsd-questions@freebsd.org> Subject: Filtering Email Message-ID: <2E557AFF-35A1-4D08-8FA9-10C65BF4ABDE@lafn.org>
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I have a local mail server (postfix, dovecot LDA) that receives mail = that is forwarded from my main account's mail server. Virtually all = mail is forwarded so the received from address is the same for all. For = a number of years we have used drive-by mail blocking on the main MTA. = Basically it sends a TEMP_FAIL to the first email from an unknown sender = and then if they later retry, it is accepted. This blocked over 90% of = the spam a few years ago as spammers didn't bother to pay for retries. = However, the environment has changed and it appears that the spammer's = MTAs now do retry so a lot of spam is getting through. I am looking to be able to filter mail on the local MTA (either postfix = or dovecot) so that I can have a table of IP addresses/names that if any = appear in any Received header the email is filtered to the bit bucket. = It appears that is possible in dovecot pigeonhole (I am using that). = However, it is not table driven. You have to write a rule for each = name/IP. I don't see anyway to have it refer to a table. Is such = possible? =E2=80=94 Doug
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