Ken Peng via mailop <[email protected]> writes: > May 9, 2023 at 4:07 AM, "Gellner, Oliver via mailop" <[email protected]> > wrote: > > >> >> If a receiver only accepts emails from sender addressed domains for which MX >> or A records exist (such checks are performed by many receiving servers), it >> means a sender has to 1. set up a DNS zone and 2. create a MX or A record >> within it. > > > No. A DNS zone is not needed at all for sending email. > > My ex-employer is a Nasdaq listed company, whose business email is with > @staff.sina.com.cn. It has MX only, not a zone. > > $ dig staff.sina.com.cn soa +short > > $ dig staff.sina.com.cn mx +short > 10 staffmx.sina.com.cn. > 10 staffmx1.sina.com.cn.
I agree with these pattern, because nowdays people like easy setup via Cloudflare, with no serious. > Also, my policy in Postfix has setted up to reject messages from > unknow_sender_domain, which means if a domain has neither MX nor A, it would > be rejected by me. > > smtpd_sender_restrictions = permit_mynetworks, permit_sasl_authenticated, > reject_unknown_client_hostname, reject_unknown_sender_domain > > > As you see, Postfix's reject_unknown_sender_domain validates only MX and A, > not SOA. > > regards. Good comments, thanks! Sincerely, Byung-Hee -- ^고맙습니다 _布德天下_ 감사합니다_^))// _______________________________________________ mailop mailing list [email protected] https://list.mailop.org/listinfo/mailop
