SMTP error from remote mail server after initial connection: 501 PTR hostname must resolve to IP

SMTP error from remote mail server after initial connection:
    501 PTR hostname must resolve to IP
sophy skaAsked:
Who is Participating?

[Product update] Infrastructure Analysis Tool is now available with Business Accounts.Learn More

x
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

Sam Simon NasserIT Support ProfessionalCommented:
check the solutions here
https://www.experts-exchange.com/questions/24447785/PTR-hostname-must-resolve-to-IP.html
https://www.experts-exchange.com/questions/20904526/501-5-7-1-Sender-IP-must-resolve.html

and as mentioned on spiceworks https://community.spiceworks.com/topic/1420914-501-ptr-hostname-must-resolve-to-ip
quick update, used "MXtoolbox" to look up our domain, entered our public ip - that is connected to our mailserver

an received

Type: PTR

IP :  our correct IP

Domain name : mail.domainname.com

TTL: 24hrs

dns lookup =

reported by ns1.virginmedia.net on 2/1/2016 etc etc....

so this looks ok - to my untrained eye
0
AlanConsultantCommented:
Hi,

You need to ask your ISP to add a Reverse DNS (PTR) Record for you with your domain name.

They will know exactly what this means, and only your ISP can do that for you - its not something you can generally do yourself.

Alan.
0
Dr. KlahnPrincipal Software EngineerCommented:
If you're on a dynamic DNS connection where your IP address can change without notice or a "static IP" connection from an ISP without proper RDNS, then the only real solution for this problem is to route outgoing mail through a third party such as SMTP2Go.  I find it easier to route mail through them anyway; they take care of a lot of issues that are tedious and annoying for a standalone MTA.

SMTP2Go will route up to 1,000 outgoing emails a month free of charge.

https://www.smtp2go.com/pricing/
0

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
AlanConsultantCommented:
Solutions / answers provided.
0
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
Email Servers

From novice to tech pro — start learning today.