Improve error handling if the database goes AWOL. Record the _original_
{IP,HELO} as known resender.
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@ -56,7 +56,7 @@ greylist_mail:
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WHERE helo='${quote_sqlite:$sender_helo_name}' \
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AND host='$sender_host_address';
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# Generate the mail identity (as described above)
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# Generate a hashed 'identity' for the mail, as described above.
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warn set acl_m_greyident = ${hash{20}{62}{$sender_address$recipients$h_message-id:}}
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# Attempt to look up this mail in the greylist database. If it's there,
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@ -65,23 +65,39 @@ greylist_mail:
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warn set acl_m_greyexpiry = ${lookup sqlite {GREYDB SELECT expire FROM greylist \
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WHERE id='${quote_sqlite:$acl_m_greyident}';}{$value}}
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# If the mail isn't already the database, defer it with an appropriate
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# message, and add it. Do the addition to the greylist database as a
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# hackish side-effect of the log-message. This is where the 5 minute
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# timeout is set ($tod_epoch + 300), should you wish to change it.
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defer condition = ${if eq {$acl_m_greyexpiry}{} {1}}
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log_message = Greylisted $h_message-id: for offences: ${sg {$acl_m_greylistreasons}{\n}{,}}\
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${lookup sqlite {GREYDB INSERT INTO greylist \
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# If the mail isn't already the database -- i.e. if the $acl_m_greyexpiry
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# variable we just looked up is empty -- then try to add it now. This is
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# where the 5 minute timeout is set ($tod_epoch + 300), should you wish
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# to change it.
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warn condition = ${if eq {$acl_m_greyexpiry}{} {1}}
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set acl_m_dontcare = ${lookup sqlite {GREYDB INSERT INTO greylist \
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VALUES ( '$acl_m_greyident', \
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'${eval10:$tod_epoch+300}', \
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'${eval10:$tod_epoch+30}', \
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'$sender_host_address', \
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'${quote_sqlite:$sender_helo_name}' );}}
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# Be paranoid, and check if the insertion succeeded (by doing another lookup).
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# Otherwise, if there's a database error we might end up deferring for ever.
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defer condition = ${if eq {$acl_m_greyexpiry}{} {1}}
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condition = ${lookup sqlite {GREYDB SELECT expire FROM greylist \
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WHERE id='${quote_sqlite:$acl_m_greyident}';} {1}}
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message = Your mail was considered suspicious for the following reason(s):\n$acl_m_greylistreasons \
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The mail has been greylisted for 5 minutes, after which it should be accepted. \
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We apologise for the inconvenience. Your mail system should keep the mail on \
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its queue and retry. When that happens, your system will be added to the list \
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genuine mail systems, and mail from it should not be greylisted any more. \
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In the event of problems, please contact postmaster@$qualify_domain
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log_message = Greylisted <$h_message-id:> from <$sender_address> for offences: ${sg {$acl_m_greylistreasons}{\n}{,}}
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# Handle the error case (which should never happen, but would be bad if it did).
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# First by whining about it in the logs, so the admin can deal with it...
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warn condition = ${if eq {$acl_m_greyexpiry}{} {1}}
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log_message = Greylist insertion failed. Bypassing greylist.
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# ... and then by just accepting the message.
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accept condition = ${if eq {$acl_m_greyexpiry}{} {1}}
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# OK, we've dealt with the "new" messages. Now we deal with messages which
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# _were_ already in the database...
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# If the message was already listed but its time hasn't yet expired, keep rejecting it
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defer condition = ${if > {$acl_m_greyexpiry}{$tod_epoch}}
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@ -90,11 +106,15 @@ greylist_mail:
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Reason(s) for greylisting: \n$acl_m_greylistreasons
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# The message was listed but it's been more than five minutes. Accept it now and whitelist
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# the sending host by its { IP, HELO } so that we don't delay its mail again. The addition
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# to the database is again done as a hackish side-effect; this time a side-effect of
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# evaluating a condition which comes out as '1' whether the database bit succeeds or not.
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accept condition = ${lookup sqlite {GREYDB INSERT INTO resenders \
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VALUES ( '$sender_host_address', \
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'${quote_sqlite:$sender_helo_name}', \
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'$tod_epoch' ); }{1}{1}}
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# the _original_ sending host by its { IP, HELO } so that we don't delay its mail again.
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warn set acl_m_orighost = ${lookup sqlite {GREYDB SELECT host FROM greylist \
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WHERE id='${quote_sqlite:$acl_m_greyident}';}{$value}}
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set acl_m_orighelo = ${lookup sqlite {GREYDB SELECT helo FROM greylist \
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WHERE id='${quote_sqlite:$acl_m_greyident}';}{$value}}
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set acl_m_dontcare = ${lookup sqlite {GREYDB INSERT INTO resenders \
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VALUES ( '$acl_m_orighost', \
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'${quote_sqlite:$acl_m_orighelo}', \
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'$tod_epoch' ); }}
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logwrite = Added host $acl_m_orighost with HELO '$acl_m_orighelo' to known resenders
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accept
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