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How to setup Reverse DNS on our email server

morten444
morten444 asked
on
Medium Priority
1,144 Views
Last Modified: 2012-06-21
Hi
I need some help to setup reverse DNS server for our mail server. Before when I used DNS Tools it showed that we had Reverse DNS Server.
Now it says we dont and I dont know why

IP on mail server is: 87.116.17.66
We dont have our own DNS Server on our server

in Imail Software we use, we have to key in DNS Servers and we use our ISP's DNS Servers:
83.136.89.6 and  83.136.89.4

We have 5 domain names + on our server and they are all sending with our smtp server
2 examples are
xxx@e-advice.dk
xxx@dmm-support.dk

When we send mails to some customers we get:
>Server response to MAIL FROM:
>550 5.7.1 Connections not accepted from servers without a valid sender
>domain.nlpi127 Fix reverse DNS for 87.116.17.66

We are using "gratisdns.dk" for all our dns records for all the domains, so I guess I can add something in there somewhere, but I have no idea what

At the moment I have one thing saying:
v=spf1 a mx ip4:87.116.17.66 mx:e-advice.dk ~all  

Can anyone advice me what to do from here?
Any concrete examle on what to write under where in order to get a reverse DNS for our IP that will help all our domains sending from it?


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Senior infrastructure engineer
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Top Expert 2012
Commented:
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Author

Commented:
Hi. Thanks for your answer:

1 question
If all domains on our server will use the same SMTP Server:
pop3: e-advice.dk
smtp: e-advice.dk

Is it enought that our ISP will create only a record for this one domain name?
We are rapedly getting more sites and would prefere not to contact them every time

Regards
Ernie BeekSenior infrastructure engineer
CERTIFIED EXPERT
Top Expert 2012

Commented:
Mm, that's a good one.

Afaik that will work. But if you are sending emails from other domains from that server you have to make sure that the SPF records are set up to reflect that.

So one PTR should work with the correct SPF records (and those will go through the DNS provider).

Author

Commented:
I see
So our ISP will sort reverse dns

and we will throgh our DNS hosting set a SPF Record for each of the domains sending mails from our server. That means adding a line like this for each domain:
v=spf1 a mx ip4:87.116.17.66 mx:e-advice.dk ~all
v=spf1 a mx ip4:87.116.17.66 mx:dmm-support.dk ~all

etc
Have I understood that correct?
Ernie BeekSenior infrastructure engineer
CERTIFIED EXPERT
Top Expert 2012

Commented:
You're understanding it quite good.

The PTR record is to check if your mailserver is who it says it is.
The SPF records are to determine what servers are allowed to send mail for your domain(s).

That's all there is to it ;)

Author

Commented:
Thanks
We have now resolved the reverse DNS with our ISP.
Thanks for all your help
Ernie BeekSenior infrastructure engineer
CERTIFIED EXPERT
Top Expert 2012

Commented:
Glad I could help :)

And thx for the points.
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