Unwanted Language in the Message Body

Add spam score if unwanted languages in the message body

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Problem

Receiving spam mails with unwanted/unknown language(s) in the message body.

Solution

Mails contains with unwanted language(s) in the message body can be prevented by identifying the language and adding spam score to the respective message. SpamAssassin having built in module TextCat which helps to prevent this kind of emails.

Step 1:

• Load TextCat module from a custom file /opt/zimbra/data/spamassassin/localrules/custom_plugins.pre

echo -e "loadplugin Mail::SpamAssassin::Plugin::TextCat\n" > /opt/zimbra/data/spamassassin/localrules/custom_plugins.pre

Notes:

Run as zimbra user [su - zimbra]

Default file of TextCat module is /opt/zimbra/data/spamassassin/localrules/v310.pre

Step 2:

• Add below line in the file "/opt/zimbra/conf/salocal.cf.in"

ok_languages <Short code of language one>,<Short code of language two>

Example:

ok_languages en,es

Notes:

ok_languages means spam assassin will accept emails in those languages and it will add spam score to all other languages.

We can add ok_languages before the line # accept email from zimbra support and forums

Step 3:

• Edit spam score for unwanted languages. Open "/opt/zimbra/data/spamassassin/rules/50_scores.cf" and edit UNWANTED_LANGUAGE_BODY

score UNWANTED_LANGUAGE_BODY <score>

Example:

score UNWANTED_LANGUAGE_BODY 4.0

Step 4:

• Verification, send an email with unwanted language in the body and check X-Spam-Status of the message in recipient side.

Example:

If message identified unwanted language, it will be tagged as

X-Spam-Status: No, score=4.59 required=6.6 tests=[DKIM_INVALID=0.1, DKIM_SIGNED=0.1, HTML_MESSAGE=0.001, NO_DNS_FOR_FROM=0.379, T_REMOTE_IMAGE=0.01, UNWANTED_LANGUAGE_BODY=4]

Reference:

https://metacpan.org/pod/Mail::SpamAssassin::Plugin::TextCat

Submitted by: Raghu Noti