As i understand trouble is not concerned, however i am sure most (if not all) the you had actually to configure mail, so you may understand where is problem.

You are watching: Reverse dns is not a valid hostname

When i am check for difficulties on mxtoolbox, i get one warning:Category: smtp Host: Result: Reverse DNS is no a precious Hostname

And right here is what lock say once i press much more Info:

More Information around Smtp precious HostnameYour reverse DNS document (PTR) is no a valid organize name. Follow to email sending best practices, a PTR Record must be a valid host name. If the PTR record is not a valid hostname, there is a likelihood that you will endure email delivery issues with anti-spam services.

Any principles how to deal with this warning?

jurgis January 9, 2021, 12:28pm #2

Problem solved.In Reverse DNS Management have to be not simply

ramin January 9, 2021, 8:00pm #3

You should be an excellent to walk if the turning back DNS lookup matches the SMTP greeting. The way I do it is relatively typical: a mail sending out domain top top the server’s IP is likewise used for the server hostname, and the hostname is used for rDNS and also SMTP greeting.

calport January 9, 2021, 8:49pm #4

In Reverse DNS Management must be not just

Not really. The rdns need to ideally be set to the hostname the and the hostname the need to (must!) be a subdomain - e.g. Vps.domain.tld

I are afraid
jurgis the something is amiss through your construction if reverse DNS need to be set to mail.domain.tld because that it to work on her system.

1 prefer
jurgis January 9, 2021, 11:16pm #5

I did all tests on mxtoolbox and also i have no errors, or warnings = everything passed.if reverse DNS is no configured correctly, climate something shouldn’t work, right?what do not do it work? how have the right to i test?

P.S. And also ignore “must be”. Perhaps it do not do it be choose that (ideally), however this readjust fixed warning top top mxtoolbox and also for currently i don’t check out any an unfavorable effect.

RJM_Web_Design January 11, 2021, 12:19am #6

mxtoolbox has tendency to emphasis on difficulties that will affect mail delivery; and also most mail admins simply require that rDNS it is in valid, definition that the IP resolves to some valid and verifiable FQDN ~ above the server.

But “valid” isn’t the exact same thing as “correct.” The preferred way to perform it is for rDNS to allude to the hostname.

Strictly speaking, the only times you’d desire rDNS to suggest to mail.domain.tld would be either if that’s also the hostname, for example, a committed mail server; or if the mail server runs on its very own IP, also if it’s held on the exact same phsyical server as Web, etc.


Joe January 11, 2021, 1:07am #7

A most incorrect information here, though every with an excellent intentions.

So, you need a PTR that resolves come a name the works.

The PTR does not must resolve to the surname you usage for your server (the FQDN the you set to do install happy). The does not should resolve come a domain girlfriend own/control. The does should resolve back to the right IP resolve when its A document is looked up.

Here’s the most necessary thing: You probably don’t have any type of control over her PTR unless you clearly request it from your hosting provider/colo/ISP/whatever. And, the does not matter, as lengthy as the previous i is true.

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In short: Lookup your IP resolve with the host command. Does it have actually a completely qualified domain name? that absolutely does not issue what that name is, it just needs to deal with to one FQDN. And, does the FQDN resolve earlier to the IP address? that’s it. That’s every you need. If your hold gets the right, don’t fuck through it. If your hold gets it wrong, or over there is naught returned, questioning them come delegate come you so girlfriend can develop a PTR because that it (or offer them a surname to usage for the PTR, every little thing makes lock happiest). You nothing care about PTRs other than to understand that you have one for your IP and that it resolves ago to the best IP in the other direction. Don’t do it more daunting or complicated than it needs to be.