On 22/11/2019 08:46, Alessandro Vesely via mailop wrote:
Plain forwarding, that is without changes except trace header fields, needs no From: munging.
Only if the original message is also DKIM signed. I see quite a few people using DMARC with only SPF. I guess that they haven't worked out how to use DKIM with their mail server yet, and, since 'normal' messages will pass DMARC with just SPF, then they leave it at that.
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