On Mon, April 22, 2019 11:31, John Leslie wrote: > I got a surprise trying to confirm a dental appointment > > > status=SOFTBOUNCE (host alt2.aspmx.l.google.com[172.217.192.26] said: > 550-5.7.1 This message does > not have authentication information or fails to pass 550-5.7.1 authentication > checks. To best > protect our users from spam, the 550-5.7.1 message has been blocked.
I see dozens of these daily for mail my customers send to Google but with 4XX codes. host alt1.gmail-smtp-in.l.google.com[74.125.141.26] said: 421-4.7.0 This message does not have authentication information or fails to pass 421-4.7.0 authentication checks. To best protect our users from spam, the 421-4.7.0 message has been blocked. Please visit 421-4.7.0 https://support.google.com/mail/answer/81126#authentication for more 421 4.7.0 information. v124si3378595vka.79 - gsmtp (in reply to end of DATA command) Google must be starting to enforce DKIM/SPF/DMARC. I've been telling customers that 5XX would be coming and to configure DKIM/SPF but ... > > Obviously, I have reverted to telephonic reply... > > > But this seems like something worth understanding; and this list seems > an excellent place to find someone who understands what google is doing. > > Anyone volunteer to give me a pointer? > > > -- > John Leslie <j...@jlc.net> > > > _______________________________________________ > mailop mailing list mailop@mailop.org > https://chilli.nosignal.org/cgi-bin/mailman/listinfo/mailop > > _______________________________________________ mailop mailing list mailop@mailop.org https://chilli.nosignal.org/cgi-bin/mailman/listinfo/mailop
