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> > >Greylisting seems to be the most effective way of eliminating unwanted |
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> > >email. The problem is that it also has the potential to eliminate a |
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> > >legitimate email. Couldn't a feature be added to greylisting software |
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> > >that dispatches an email to the sender of any email that is |
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> > >temporarily rejected and doesn't retry within a certain amount of |
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> > >time? The email could say something like, "Your message of {date} was |
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> > >rejected as possible spam. Please call us at {phone_number}." |
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> > |
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> > att.biz accounts do something like this. It isn't a phone call, but |
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> > "go to $website and enter $code to unblock your mail to $recepient." |
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> |
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> TMDA (in portage) could be set up to do something like this, I |
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> believe. |
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|
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I'm going to go ahead and try greylisting. It sounds like regular |
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postfix checks can reject legitimate email just like greylisting can |
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end up doing, but postfix checks are cutting spam in half and it |
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sounds like greylisting will do a lot better. |
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|
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I'm going to replace the following postix config: |
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|
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smtpd_delay_reject = yes |
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smtpd_helo_required = yes |
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smtpd_helo_restrictions = |
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permit_mynetworks, |
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reject_non_fqdn_hostname, |
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reject_invalid_hostname, |
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permit |
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smtpd_sender_restrictions = |
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permit_mynetworks, |
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reject_non_fqdn_sender, |
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reject_unknown_sender_domain, |
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permit |
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smtpd_recipient_restrictions = |
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permit_mynetworks, |
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reject_non_fqdn_recipient, |
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reject_unknown_recipient_domain, |
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reject_unauth_destination, |
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permit |
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smtpd_data_restrictions = |
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reject_unauth_pipelining, |
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permit |
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|
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with this: |
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|
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smtpd_recipient_restrictions = |
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permit_mynetworks, |
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check_policy_service inet:127.0.0.1:10030 |
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reject_unauth_destination, |
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permit |
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|
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How does that look? |
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|
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- Grant |
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-- |
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