From: James B. Byrne <byrnejb at harte-lyne.ca> > The CentOS list uses Mailman (2.1.12) and as another has pointed out, recent > changes to DMARC enforcement at Yahoo, AOL, and now apparently Google, causes > DKIM signed email forwarded though mailman to fail the authentication checks > relating to DKIM. This is either treated as suspicious (as is apparently the > case with Google) or rejected outright, as is the case with Yahoo and AOL. I use yahoo mail for my mailing lists and I "only lost" around 5 of them (disabled because of bounced messages) out of 22. And, as you guessed, CentOS ml seems unaffected so far. JD