LukeSmithxyz
PTR Records
I have my email set up on a Vultr VPS. In my settings, as instructed in the README, I have the Reverse DNS set to mydomain.com (obviously my actual domain). However, when I check on mxtoolbox, it tells me it is not a valid hostname.
I'm not sure where I went wrong here, but I cannot send email to gmail users from this account until I'm able to fix it, as they get rejected for not having a PTR record set up.
Would greatly appreciate any help I can get here.
Do you get "Reverse DNS is not a Valid Hostname" from mxlookup? So do I, I'm pretty sure it is because it tries to check if your IP address resolves to mail.domain.com instead of domain.com. That doesn't matter, it should work anyway.
Did you try dig -x <your-ip> just to see if you get your domain name? Also, are you sure that gmail rejects you because of your PTR record?
Do you get "Reverse DNS is not a Valid Hostname" from mxlookup?
Yes.
Did you try `dig -x
gives back my domain (not mail.)
are you sure that gmail rejects you because of your PTR record?
That's what the messages I get back from them say:
The IP address sending this 550-5.7.25 message does not have a PTR record setup, or the corresponding 550-5.7.25 forward DNS entry does not point to the sending IP. As a policy, 550-5.7.25 Gmail does not accept messages from IPs with missing PTR records.
Just to make sure, your forward DNS points to just your IP address right? Could there be a NAT or firewall or something that updates the public IP address? What do you get if you run curl ifconfig.me on the server?
What do you get if you run curl ifconfig.me on the server?
It returns the same IP address I have the domain pointed to....sorry for the delay on that response.
I'm having the same issue. Any resolve? I get the correct ip address as well. I tried reinstalling the script. I thought it might of been an issue with port 25 being block however, it was not blocked. My reverse DNS is pointed to my url. I'm pretty new to email so I hope I'm not missing something simple.
I've also used telnet to test making an email. I keep getting 450 4.7.1 Client host rejected: cannot find your reverse hostname. However on my VPS. I've set the revese dns (both ipv4 and 6) to my domain name.
Same issue checking mail-tester.com it seems to be an issue relating to MX records
I get a total score of 6.8/10 https://www.mail-tester.com/test-9mkick825
I got the same error. Fixed it by adding a AAAA record on my DNS settings, with my VPS' IPv6 address as the answer. This is apparently a really vague error message from Google though, as I've seen multiple different solutions on the internet.
I got the same error. Fixed it by adding a AAAA record on my DNS settings, with my VPS' IPv6 address as the answer. This is apparently a really vague error message from Google though, as I've seen multiple different solutions on the internet.
I already have a AAAA record for my IPv6 address in my DNS settings, so that's not the cause.