Gao skrev den 2017-11-17 21:34:
So what is the solution here? Should I add the mail.mytestmx.com to zeta.othermx.com's SPF record and make it trust it? If so are there any risk?
yes recipient validation on backup mx mta, eq dont accept mails that cant be delivered
the error is that mx dont add all ips to spf, and or final destination did forget to whitelist backup mx ip, since this is not a border mx ip
silly and simple
