My main server domain passes rDNS without issues when trying to reply to a craigslist ad. If one of my clients who are on a separate (shared) IP address try it it immediately bounces.
Hey John,
No IPv6 on this server. I believe that my server PTR is handled by the data center it resides in because I had them add mine (I think but it’s been like 14 years!)
I contacted them last night about adding additional IPs and domains to their delegation and am waiting to hear back from them as I type this - its been like 12 hours already.
Can we have multiple domains doing reverse DNS back to a single IP address if this is indeed the issue?
Datacentres usually provision within the hour for ptr/rdns
Yes, it is possible but highlight unusual for this to happen
All you need is a ptr/rdns for your IP address and make sure you have a corresponding A record matching the ptr/rdns record e.g. Rdns = myrdns.mydomain.com and A record mydns.mydomain.com 1.1.1.1 (which matches your server or shared IP address)
If it becomes an issue due to time for rdns, you could set all email to be sent from your server IP address, and not any other IP address
Many thanks, and replied to your PM
Firstly though, please delete your PTR shown in your picture you PM’d me, you do not control PTR so it is not needed in IW DNS
Also, you have a PTR/Rdns on both IP but only 1 A record
To overcome quickly, setup an A record in m**p.com for IP ending 166, my PM to you should make more sense as I have ommited full domain and IP details here. However, this is not 100% as you will be serving 2 IP for domain, so you maybe better to change the mail sender IP in qmail as follows
SSH into server
as root or sudo vi /var/qmail/control/senderip
change all IP to IP ending 164
save
service smtp restart
logout
check email now been accepted with no bounce back
Thank you. I edited the IP address in the senderip file. I think that will work for now. I just tried it and no bounce! Your a life saver.
Im concerned about changing the PTR on my DNS. Could this take down the internet connection at the server? Its a long drive to the data center.
Thanks again for all your help!
There really is no downside from sending on the same IP as me I guess except for possible spamming issues but I know most of my customers and I wouldn’t expect them to do it intentionally.
Ahh the drive to datacentre haha know it well here in uk for me, over 200 miles away
As long as you only delete the PTR record it should not bring anything down, as your PTR is been served by your datacentre and not your systems. Check the test in my first pm to you, the records do not match your PTR
Sending email from IP address for all is fine, no issues and usually you have a second IP address in readiness, presetup with PTR/Rdns (do as I advice, and set this with different record name), so if your main sending IP address is blacklisted, it takes seconds to change to clean secondary sending IP address and all is good whilst you clean the main sending IP address, then change them back when your happy
