Domain Names/Static IP
Managing, controlling, and support for Custom Domain Names
Back to Top

RDNS / PTR records

SOLVED
RickDrew
Visitor

RDNS / PTR records

We have five IP's we use to host around 30 domains, mostly our own and a few for clients (ski club, local restaurant, etc..) Many have their own email addresses (we use hmail server), although we limit email for clients to incoming only (we don't want to risk spamming, etc.) We do have outgoing email allowed for our personal domains. Recently all the major ISP's have really cracked down. We used to be able to send to Gmail, AOL and Comcast. Not any more. All want the RDNS to match the sending domain. Is it possible to have RDNS for multiple domains on a single IP? Even if we need to have one RDNS per IP - We need to do something - now 90% of our mail is not being accepted. I find it incredible that Comcat bounces email from a Comcast IP. Thanks Rick Drew

Accepted Solution

Re: RDNS / PTR records

Try sending an IM to any of the red-highlighted "Comcast_" users on this forum, as they are moderators and can submit the PTR request for you. That will probably net you a faster response.

 

EDIT and to your question, no, i don't believe that Comcast will assign multiple records to a single address. As well, from what I'm reading it doesn't seem like a great idea anyway. See http://serverfault.com/questions/618700/why-multiple-ptr-records-in-dns-is-not-recommended

View solution in context
Tags (4)
RickDrew
Visitor

Re: RDNS / PTR records

Hey COMCAST - anyone home?!?!

Trusted Forum Contributor

Re: RDNS / PTR records

Try sending an IM to any of the red-highlighted "Comcast_" users on this forum, as they are moderators and can submit the PTR request for you. That will probably net you a faster response.

 

EDIT and to your question, no, i don't believe that Comcast will assign multiple records to a single address. As well, from what I'm reading it doesn't seem like a great idea anyway. See http://serverfault.com/questions/618700/why-multiple-ptr-records-in-dns-is-not-recommended

Highlighted
Forum Contributor

Re: RDNS / PTR records

The RDNS only needs to match what the HELO message from the mailserver is.  It does NOT need to match what the "sending domain"  is.  In emailspeak, the envelope or header addresses don't come into this.

 

If you want my $0.02 (which your not going to like I am sure) I recommend you find a nice smartmailer on the Internet and relay all your outbound mail through it.  It sounds like your not that well versed in SMTP (hey, that's NOT a slam) and these days there's a LOT of standardized stuff and defacto stuff that both smart people and idiots are doing with their mailservers on the Internet when it comes to accepting email.  Either that or your going to need to get on some email forums and start reading and learning. (like the Sendmail forum or the Postfix forum, etc.)  You will find plenty of email gurus there.

 

Tags (1)
RickDrew
Visitor

Re: RDNS / PTR records

Here's my problem - I've been using hMail server for around 6 years. I host domains for friends and family, plus a couple of local clubs.

 

We have five dedicated IP's. We have as many as 7 domains on one IP.  We had zero problems until this year. According to Comcast, our server is set up fine and should not have bounce problems. But it does.

 

sinanju.com - every tool I use finds no problems. But Comcast, Gmail, etc still bounce it.

 

MX records:

10   mail.sinanju.com   74.94.122.3
0   sinanju.com   74.94.122.3

 

RDNS:

3.122.94.74.in-addr.arpa ->  sinanju.com

 

Helo:

sinanju.com

 

However, I noticed that there are two RDNS records. I've asked Comcast to remove the incorrect one two times. It's still there.

 

Reverse (PTR) record:
3.122.94.74.in-addr.arpa ->  cmscracing.com
3.122.94.74.in-addr.arpa ->  sinanju.com

 

We don't charge anything for the mail or websites - as I said - friends and family - so we can't pay an outside service.

 

Any suggestions appreciuated.

 

Thanks

Forum Contributor

Re: RDNS / PTR records

Send an email to support@ipinc.net and in the subject line say "Please respond with the PTR record I need to be using"  Send it from any domain you wish on your server.

 

I'll examine the header and reply with what is supposed to be in use.