On Wed, 14 May 2014 19:53:22 +0200, "L.W. van Braam van Vloten" said:

> either the Listserv logs or in my mail logs. For example, mail to
> Yahoo addresses gets delivered normally and I see hardly any delivery
> errors - nothing unusual anyway.

The problem is when somebody *from* Yahoo *posts* to your list, and some
*other* site bounces the mail due to a DMARC failure.

If you keep changelogs, the deletes will be in there.  Figuring out whether
it was a DMARC-related delete could be a problem....

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