This article was written for a CentOS 6. SpamAssassin is an effective spam filter that’s relatively easy to install and run. In this case, each user can choose to either reject or quarantine incoming spam. If you run your own mail server you’ll want it to run spam filtering software to reduce the number of unsolicited emails your users receive. In this case, each user will need to have a spam handling rule on their inbox. It uses a number of tests and criteria to identify. If you wish to change this behavior you can reconfigure Citadel to only flag spam instead of rejecting it. SpamAssassin is an intelligent and powerful spam fighting tool. Spam is bounced ham (non-spam) is delivered. The Spamassasin custom rulesets page has many more and their current status.Ĭitadel's SpamAssassin integration only works on a site-wide basis.The Mailscanner Wiki might also give you useful hints.Rules Du Jour is an auto-updater for the SARE ruleset (although you may be able to do this with sa-update too).SARE SpamAssassin Rules Emporium contains lots of extra community-supported rules.Always configure sa-update to download and install new SpamAssassin rules automatically. Regarding spam protection strategies in Zimbra, a mention deserves SpamAssassin, an Open Source anti-spam platform that can provide system administrators with a filter that can classify emails and block spam.Other suggested SpamAssassin tools and tips: # High score for URL's whose IP addresses are in rbl Them by putting the following lines into local.cf: These tests are disabled by default! You have to enable and high-score We recommend that you limit the maximum mail size to 150 - 250 Kbytes, which is usual for mail messages in HTML format with images. By default, the maximum email size is 256000 bytes. You can also configure SpamAssassin to outrightly reject (by scoring extremely high)Īny message which contains a URL whose hostname resolves to an IP address on one of the Open for editing the configuration file /etc/psa/psa.conf Specify the desired value in bytes for the parameter SAMAXMAILSIZE. Free and easy to use zip tools are commonlyĪvailable. If users complain, suggest archiveįormats such as Zip. You should configure SpamAssassin to reject messages with attachments that are WindowsĮxecutables, because these are almost always malware. SpamAssassin without the need to install or configure any filters. SpamAssassin examines your mail using numerous heuristicįilters and assigns a spam score based on matches it finds.
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