On 28 Jul 2019, at 13:04, Jayson Smith wrote:

Hi,

The problem I'm familiar with is messages *from* AOL/Hotmail/Yahoo/etc. being rejected by other Email providers.

It happens in both directions. Providers who publish a "p=reject" DMARC policy typically also honor other providers' "p=reject" DMARC policies. If a mailing list makes any change to messages, it should also either munge From or wrap messages to avoid problems. You can do that for all messages, only for "p=reject" sender domains, or for both "p=reject" and "p=quarantine" domains.

--
Bill Cole
b...@scconsult.com or billc...@apache.org
(AKA @grumpybozo and many *@billmail.scconsult.com addresses)
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