Provided by: spamassassin_3.4.4-1ubuntu1_all
FromNameSpoof - perform various tests to detect spoof attempts using the From header name section
loadplugin Mail::SpamAssassin::Plugin::FromNameSpoof # Does the From:name look like it contains an email address header __PLUGIN_FROMNAME_EMAIL eval:check_fromname_contains_email() # Is the From:name different to the From:addr header header __PLUGIN_FROMNAME_DIFFERENT eval:check_fromname_different() # From:name and From:addr owners differ header __PLUGIN_FROMNAME_OWNERS_DIFFER eval:check_fromname_owners_differ() # From:name domain differs to from header header __PLUGIN_FROMNAME_DOMAIN_DIFFER eval:check_fromname_domain_differ() # From:name and From:address don't match and owners differ header __PLUGIN_FROMNAME_SPOOF eval:check_fromname_spoof() # From:name address matches To:address header __PLUGIN_FROMNAME_EQUALS_TO eval:check_fromname_equals_to()
Perform various tests against From:name header to detect spoofing. Steps in place to ensure minimal FPs.
The plugin allows you to skip emails that have been DKIM signed by specific senders: fns_ignore_dkim googlegroups.com FromNameSpoof allows for a configurable closeness when matching the From:addr and From:name, the closeness can be adjusted with: fns_extrachars 50 Note that FromNameSpoof detects the "owner" of a domain by the following search: <owner>.<tld> By default FromNameSpoof will ignore the TLD when testing if From:addr is spoofed. Default 1 fns_check 1 Check levels: 0 - Strict checking of From:name != From:addr 1 - Allow for different tlds 2 - Allow for different aliases but same domain
The following tags are added to the set if a spoof is detected. They are available for use in reports, header fields, other plugins, etc.: _FNSFNAMEADDR_ Detected spoof address from From:name header _FNSFNAMEDOMAIN_ Detected spoof domain from From:name header _FNSFNAMEOWNER_ Detected spoof owner from From:name header _FNSFADDRADDR_ Actual From:addr address _FNSFADDRDOMAIN_ Actual From:addr domain _FNSFADDROWNER_ Actual From:addr detected owner
header __PLUGIN_FROMNAME_SPOOF eval:check_fromname_spoof() header __PLUGIN_FROMNAME_EQUALS_TO eval:check_fromname_equals_to() meta FROMNAME_SPOOF_EQUALS_TO (__PLUGIN_FROMNAME_SPOOF && __PLUGIN_FROMNAME_EQUALS_TO) describe FROMNAME_SPOOF_EQUALS_TO From:name is spoof to look like To: address score FROMNAME_SPOOF_EQUALS_TO 1.2 perl v5.30.0 2020-02Mail::SpamAssassin::Plugin::FromNameSpoof(3pm)