On 29 Mar 2021, at 3:20, Loren Wilton wrote:
I'd say that presence of X-MC-xxx headers in a received message is a
100% guarantee of a targeted advertizing message,
If mail comes from MailChimp, I'd say that's a rock-solid determination.
and a 99% guarantee that the message is a spam. If the values given
for the options in the headers are obviously invalid, that rises to a
100% chance that the message is spam.
I'd call these headers a great spam sign.
I would not be so broad with that. I have 49 messages in my personal
archives with X-MC-User headers, none of which I have classified as
spam. All appear to have come through MailChimp and be sent on behalf of
entities I have given some sort of permission to send me email,
including GitHub, Travis-CI.com, Ars Technica, and both of my local
public radio stations. I'm sure that there would be more of these extant
in my archives if I did not generally unsub from the sorts of mailings
that make the use of MailChimp-like services rational.
I expect that focusing on individual headers (other than X-MC-User)
rather than any and all X-MC-* headers would be a better filtering
approach.
--
Bill Cole
b...@scconsult.com or billc...@apache.org
(AKA @grumpybozo and many *@billmail.scconsult.com addresses)
Not Currently Available For Hire
