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http://bugs.exim.org/show_bug.cgi?id=993 Summary: greylisting implementation Product: Exim Version: N/A Platform: x86 OS/Version: FreeBSD Status: NEW Severity: wishlist Priority: medium Component: ACLs AssignedTo: [email protected] ReportedBy: [email protected] CC: [email protected] Created an attachment (id=391) --> (http://bugs.exim.org/attachment.cgi?id=391) greylist implemetation I've noticed exim has a bunch of different verification methods of incoming mail such as DKIM, content scanning, SPF, SRS and so on. But it still has no greylisting implementation, though this type of mail filtering is widely used, at least here in Ukraine and Russia. My collegue once had made greylist module that is now used by our ISP company to fight spam among other methods. So we've decided it could be useful to wide community as a compiled in module. Code is not pretty enough =) but it's a working example and can become a basis for exim's implemetation. For now it's used via dlfunc. It uses the same method of data storing as callouts, retries and other exim's DBs, so it can be tydied by exim_tidydb once it has compiled support for this type. I'm attaching .c source and here's an example of usage in ACLs: acl_check_rcpt: defer log_message = greylisted, try again later !senders = : ^root@ !acl = acl_grey_list ... acl_grey_list: defer log_message = greylisted, try again later !hosts = 127.0.0.1 : +trusted_hosts :\ ^(relay|mail|mx|smtp) : *.google.com : *.yahoo.com # parameters: <key> <defer-timeout> <allow-timeout> # key -- uniq db key for this sender # defer-timeout -- for how long we won't accept new senders with the same key (seconds) # allow-timeout -- for how long we will accept this sender w/o greylist verification (seconds) condition = ${dlfunc{/usr/local/libexec/vc_grey.so}{greylist} \ {$sender_host_address,$sender_address}{240}{604800}} message = Greylisting, please try again later accept -- Configure bugmail: http://bugs.exim.org/userprefs.cgi?tab=email -- ## List details at http://lists.exim.org/mailman/listinfo/exim-dev Exim details at http://www.exim.org/ ##
