reverse DNS and SMTP banner issues.

[maxD]

Hi all

I'm using Plesk 11
posfix
Centos 6

Now it seems I have some issues with Records, getting "Warning - Reverse DNS does not match SMTP Banner"

I do understand that to fix that my PTR record must match my Host name and also must match mailserver

like :

PTR record for for the IP of mail1.example.com must be mail1.example.com
And it must also match host name
ok let say I'm setting host name as mail1.example.com

But what if I have few domains on the server, ?


Regards

 

[abdi]

Usually your server sends mail as it self (ie its own hostname). So it really does not matter how many domains you have, all are represented by your server hostname.

 

[maxD]

Yes but i will always get then error for each domain like "Warning - Reverse DNS does not match SMTP Banner"
Cause mail1.example2.com mail1.example3.com will never match Host name
so any way to avoid that and fix thsi record "Warning - Reverse DNS does not match SMTP Banner" fr every domain on the server ?

cheers

 

[abdi]

When and where do you get that error?

And by the way SPF records can help here too ..

 

[DaveKay]

I've noticed this error when using such tools as MXtoolbox.com.

As I have a VPS, my providers IP PTR record does not match the hostname of my server.

I haven't had any real issues as I use SPF records for all my domains.

 

[abdi]

The only solution to that problem is to ask the provider create a PTR record for the IP address that matches your hostname. Some DCs provide this feature ...

 

[maxD]

Ok lads I think u did not got the problem

I can create PTR record 1 for each IP

SO let say I have few domains on the server Domain1.com Domain2.com etc

both of them are on the same server which have One host name (obviously ) and both have own Dedicated IP's IP's

I can create IP reverse (ptr record) for each IP (one per IP only, can't be done otherwise)

Everithing will work perfect if on the server will be 1 Domain then hostname of the server = PTR record = mailserver

so if we have few domains this blows away cause host name stays always one and can't match all domains

and I have suspicions that hotmail.com blocks in that case

cheers

 

[maxD]

About SPF

I've got this :

SPF record lookup and validation for: domain.com

SPF records are primarily published in DNS as TXT records.

The TXT records found for your domain are:
v=spf1 +a +mx -all

SPF records should also be published in DNS as type SPF records.
No type SPF records found.

Checking to see if there is a valid SPF record.

Found v=spf1 record for domain.com:
v=spf1 +a +mx -all

evaluating...
SPF record passed validation test with pySPF (Python SPF library)!