Knowledgebase

Answer / Solution

Blacklist/Whitelist

You can add email addresses and domains to your blacklist or whitelist by navigating to "Spam Filter / Spam Filter Lists". Add known spam domains to the blacklist or trusted domains to the whitelist to ensure better spam detection. Due to spoofing, it is not advisable to add your own email addresses to the whitelist.

When a spam sender is whitelisted, the spam report contains the line

"-100 USER_IN_WELCOMELIST"

and the spam rating will be approximately -100. The spam report can be found in the header of the email under "x-spam-report".

Blacklist for words

You can add rules for emails containing certain words by using the "Mail contains text" and/or "Subject contains text" conditions. You can handle these emails in different ways:

In the rules, you can apply the "Do not deliver message" action. Also, you can mark the email as spam with "Write specific text at the beginning of the subject" in the subject.

Custom rules

You can also navigate to "Spam Filter / Spam Filter Options / Custom SpamAssassin CF File" to create custom SpamAssassin rules instead, if you prefer to increase the spam score instead of marking these emails as spam directly. See this website to learn how to create custom rules: https://cwiki.apache.org/confluence/display/SPAMASSASSIN/WritingRules

URIBL

If you receive an unusual amount of spam emails, please check the "x-spam-report" entry in the header of one of the emails. If this contains the entry

URIBL_BLOCKED ADMINISTRATOR NOTE: The request to URIBL has been blocked. See https://wiki.apache.org/spamassassin/DnsBlocklists#dnsbl-block for more information.

then please follow the instructions on the linked website or in our Knowledge Base: https://knowledgebase.jam-software.com/7285 This step will noticeably improve the spam detection rate.

Changing existing SpamAssassin rules

If you want to change the spam score of existing SpamAssassin rules, you can follow the instructions on this website: https://cwiki.apache.org/confluence/display/SPAMASSASSIN/AdjustRuleScore.
You can also use the configurator in the Exchange Server Toolbox for this purpose. A customized default rule in the configurator overwrites the existing SpamAssassin rule.