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:
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Sam Simon NasserIT Support ProfessionalCommented:
check the solutions here

and as mentioned on spiceworks
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 :

TTL: 24hrs

dns lookup =

reported by on 2/1/2016 etc etc....

so this looks ok - to my untrained eye

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.

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.

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