sundance-communications.com/forum Forums Computers & Programming Computers, Software, Accessories E mail bouncing

Lately, many people who have emailed me for years have been receiving a bounce when sending me emails.
My ISP has made some changes,
(upgrades as they put it) and upon investigating we see that the ones bouncing do not have a reverse DNS record set up.
A few need to set up a PTR record.
I have no clue what all this means.
How the heck can an ISP ask me to tell all these people who have been emailing me for years to make these changes?
Is this something that all ISPs are going to?
Looks like for now I may end up changing ISPs.
I'm loosing to many emails.
MrG

There is a good chance you will have the same issues with other ISPs. It's usually a matter of people hosting their own email servers without DNS being done properly. Denying connections from mail servers that have no reverse DNS is one of the ways they block SPAM.

I would just tell people to go to www.dnsreport.com and fix anything that comes up red. This should include any reverse DNS issues.

So, is it possible for them to continue to operate
with no reverse DNS but grant my ISP access?
Thanks, Clinton :toast:

Not much you can do on your end. Your ISP is the one blocking other mail servers. It's kind of like getting a call where someone says they are from company X, but you want to be sure they aren't lying to you. So you check the caller ID and then do a reverse lookup to see who that number belongs to. If it's an unlisted number you cannot verify they are legit, so you give them an error message and hang up. In this case your ISP is doing that on your behalf before sending anything on to you.

It's really the responsibility of anyone running a mail server to make sure it complies with all the latest RFCs. There is a 100% chance that these people who cannot email you now, also have issues with other people using other ISPs.

Thank you Clinton, I appreciate the Info. :thumb:
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Cheers, MrG