The default Bulk rule on the email appliance only works on based on known bulk senders (MailChimp, SendGrid etc..). However there is a lot of mailing lists that do not use these services and this article will explain how to increase detection of them.
This article describe the steps to catch bulk e-mails that are not coming from bulk mailers. The following sections are covered:
Applies to the following Sophos products and versions Sophos Email Appliance
Note: If you have the default Bulk rule set to Tag, then this rule may end up double-tagging your Subject. You can also consider adding additional bulk mail headers to this rule which are listed in RFC 2369 if you are seeing them arrive through the device.
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