On 30 Jan 2019, at 20:33, Don Saklad wrote:

Thank you Martin Gregorie!

Looking for the closest thing to a list for new/novice users of all
SpamAssassin headers that can appear with descriptions for understanding
the data that can appear at each SpamAssassin header.

This is not really possible.

Run 'perldoc Mail::SpamAssassin::Conf' and read the description of the add_header directive and the TEMPLATE TAGS section. This will explain some of the information from SA that can appear in headers.

It's for new/novice users' curiosity about understanding better the data
in each SpamAssassin header that can appear in messages' headers.

Depending on how you hook SA into your mail system and how it is configured, messages can have no headers generated by SA ever or any arbitrary header with a name that starts with "X-Spam-" containing a wide range of information available to SA in arbitrary formats defined by the local configuration. Beyond the headers that can be generated by SA itself, some mechanisms for integrating SA are commonly configured to add their own headers of their own design containing SA information.

For example, the widely-used cPanel/WHM server management software uses a custom configuration for Exim (the MTA it uses) which mimics the SA X-Spam-Report, but does not quite match it. Why? I don't know.



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Bill Cole
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