Hi - > > The From: header rewriting for DMARC participants is something sourceware > > is doing now. > > Out of curiousity, is this rewriting you are talking about the cause for a > lot of mails showing up as "From: GCC List" rather than their real senders? > This has become very annoying recently.
Yes, for emails from domains with declared interest in email cleanliness, via DMARC records in DNS. We have observed mail -blocked- at third parties, even just days ago, when we failed to sufficiently authenticate outgoing reflected emails. AIUI, all this effort is driven by wanting to defeat not just spammers but also real security problems like phishing enabled by forgery, including specifically the From: header. - FChE
