> Is there something similar for domains in the email body being
> registered with a specific registrar? Is there another mail filter
> possibly capable of doing such a lookup or another way to match such
> emails?

If there isn't yet, you can probably write one using RDAP. NameCheap's
registrar ID is 1068.

See https://www.iana.org/assignments/registrar-ids/registrar-ids.xhtml 
for the current list.

-- 
Atro Tossavainen, Chairman of the Board
Infinite Mho Oy, Helsinki, Finland
tel. +358-44-5000 600, http://www.infinitemho.fi/
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