The issue seems to at least partly be caused by at least 1 user using the DMARC `reject` option. All users on email servers which respect this option (Gmail, iCloud, ...) are going to bounce emails from such a user. These bounces are going to add up on my server (there's a MailMan score system for this) and when it reaches a certain limit they are “unsubscribed” (they are actually only disabled at first).
Speaking for myself, I am (was) such a user with a `reject` policy specified in DMARC.
I would appreciate if you reconfigured the mailing list to be compliant with such a policy.
In the meantime I have configured a subdomain with relaxed SPF/DMARC rules and resubscribed with an email address that shouldn't cause any more problems.
Cheers, -- Alexandru Nedelcu alexn.org
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