My server uses Exim and mlmmj. I did not set it up - it's a virtual linux
account so I have no sudo access.

One of the mailing lists I run has a problem with DMARC - from one user!
Every time this use posts there are a load of one-off bounces because that
DMARC verification has failed.

The member concerned is @casema.nl 

Other members postings nerver bounce for that reason. It's clear that
casema.nl must have a stringent policy, but I cannot find out what is
causing the problem.

Has anyone any hints or suggestions?

mlmmj-sub version 1.2.15

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-- 
Richard Torrens.
http://www.Torrens.org for genealogy, natural history, wild food, walks, cats
and more!