Matches non RFC headers that not begin with X-

[Alarig Le Lay]

Hello,

I would like to mark as spam some mails with some non-RFC headers, like
deWBv5PD: offrespourlespros.net$
PFoRSKwhcmpngevb: 13716$
3D2rJMSW: 57$
WbCMJZG5: Gfo9K3iRJMJfbUms0jMjfpCWb+Q6Cp8F67lfYgxMoVw=$
(You can get the full mail here: https://paste.swordarmor.fr/raw/EEgF)

So, I’m looking for a test witch matches this kind of headers but I
didn’t find it. Does it exist? I could be interesting to have a regex
that matches all the headers not in https://tools.ietf.org/html/rfc4021.

-- 
Alarig Le Lay

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