Dnia 16.01.2020 o godz. 15:46:31 @lbutlr pisze: > > Recheck? What do you mean> there is no rechecking the VALID domain is > looked up, it does not have an MX record, so postfix does not attempt to > deliver it and immediately bounces the message back to the user.
But it is wrong approach. It is a perfectly correct setup to not have an MX record for a domain, but to have an A record and receive email under that address. There is no requirement (and never was) that to receive email you must have an MX record. MX record is only a nice shortcut to avoid specifying the full domain name of the mailserver in the e-mail address, and instead use only the mailserver's domain part. Instead of "u...@mailserver.domain.com" you type only "u...@domain.com" - that's what MX record is for. But "u...@mailserver.domain.com" is still perfectly valid and mail to such address *has to be* be delivered. And if there is no "mailserver.domain.com", and "domain.com" is just the full domain name of the server in question, then the A record is sufficient. MX record is superfluous. I was recently forced to add a ridiculous MX record to my domain, pointing back to the same name (eg. "rafa.eu.org MX 10 rafa.eu.org") just to satisfy some stupid mailservers that used such approach and didn't send mail to me claiming my email address is "invalid". Before that, I was using only A record for "rafa.eu.org" for quite a time without any problems. And it should stay so. Adding artificial MX records that don't have any sense doesn't look like a reasonable thing to me. -- Regards, Jaroslaw Rafa r...@rafa.eu.org -- "In a million years, when kids go to school, they're gonna know: once there was a Hushpuppy, and she lived with her daddy in the Bathtub."
