i was just wondering why 90% and more of hosting providers have alsways this dns error (form dnsreport.com)

ERROR: None of your mail server(s) seem to have reverse DNS (PTR) entries (I didn't get any responses for them). RFC1912 2.1 says you should have a reverse DNS for all your mail servers. It is strongly urged that you have them, as many mailservers will not accept mail from mailservers with no reverse DNS entry.


it seems to be important as, if i'm not wrong, some (many?) providers won't be able to receive email from that servers.

i suppose that's not so true 'cause i've never had provider with ptr setted rightly but i have always sent my emails

:confused:

Originally posted by crowdedhouse
i was just wondering why 90% and more of hosting providers have alsways this dns error (form dnsreport.com)

ERROR: None of your mail server(s) seem to have reverse DNS (PTR) entries (I didn't get any responses for them). RFC1912 2.1 says you should have a reverse DNS for all your mail servers. It is strongly urged that you have them, as many mailservers will not accept mail from mailservers with no reverse DNS entry.


it seems to be important as, if i'm not wrong, some (many?) providers won't be able to receive email from that servers.

i suppose that's not so true 'cause i've never had provider with ptr setted rightly but i have always sent my emails

:confused:

From being on many lists with Postmaster/Abuse people I can tell you many more ISPs are looking at not allowing mail from IPs withno Rdns

a lot of hosting providers don't have rdns?

Because delegating reverse is a lot of work for less than a class C and most customers don't want to pay for it.
If you're buying from a reseller they may not have it set up, or set up wrong, or can't get it delegated.

Don't run your own nameservers if you have less than a class C, or better yet they aren't swipped to you.

Best bet is bit** loud enough or change providers. SPAM is out of control and those of us that manage lots of mail are looking at any way to reduce the flow.

My .02

It really isn't that much work to delegate rev authority for more then a /24 if you have a clueful provider.

Hi - just wondering reading this if in the original question there is a little misunderstanding of rDNS [ I appologise if no misunderstanding :-) ] ........

.... when doing virtual hosting there is normally no reason to have rDNS setup for any accounts IP address but it should be configured for the main server IP as any mail sent from any account on that server is actually sent by the server IP and not the individuals IP. I have personally never seen a host without rDNS for the server IP unless this was a mistake in the setup.

YB

Its not alot of work at all. Takes all of 5mins, its just the waiting for DNS to udpate that takes the time ;)

I would reccomend you have dedicated IPs for the main functions of your server. Such as:

One IP for all web hosting
One IP for your mail server (POP3)
One IP for your mail server (SMTP)
One IP for primary/secondary DNS server

So thats 4 IPs per box. You could probably get away by having 1 IP for smtp and pop3, but it would be good practice to have a dedicated IP for each major function of the server.