Email & PTR Issues

Reindl Harald h.reindl at
Tue Nov 7 18:03:07 UTC 2017

Am 07.11.2017 um 16:31 schrieb James Pifer:
> I have issues emailing to certain domains. I use my own mail server to 
> deliver mail. It is currently not sending through SMTP Relay. The 
> failure says that I have a missing PTR record. For example:
> host[]
>      said: 550 5.7.1 Connections not accepted from servers without a valid
>      sender domain.alph151 Fix reverse DNS for 
> I also tried moving my DNS to the provider I purchased my domain name 
> from thinking that would be an easy fix. They don't support PTR records 
> and actually had no clue what they even were

you need to understand some basics: the PTR has nothing to do with your 
domain since it is the reverse DNS to the IP and oyu don#t own the IP 
itself - AT&T is your friend and a matching PTR should be on top 
priority of the checklist *before* even consider running a MTA on a machine

NetRange: -
NetName:        SBCIS-SBIS
NetHandle:      NET-108-192-0-0-1
Parent:         NET108 (NET-108-0-0-0-0)
NetType:        Direct Allocation
OriginAS:       AS7132
Organization:   AT&T Internet Services (SIS-80)

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