Ubuntu+ISPConfig+DKIM

Finally all my records are ok (SPF, DKIM, DMARK).
i did email test with score 8.8/10 at https://www.mail-tester.com
my problem:

-1.274 RDNS_NONE Delivered to internal network by a host with no rDNS
This may be a false-positive, please check the reverse DNS test below to confirm or not this issue

Your IP address 85.xxx.xxx.48 is associated with the domain 85-xxx-xxx-48.ip.kis.lt.
Nevertheless your message appears to be sent from server.MYDOMAIN.com.

You may want to change your pointer (PTR type) DNS record and the host name of your server to the same value.



Here are the tested values for this check:

• IP: 85.xxx.xxx.48
• HELO: server.MYDOMAIN.com
• rDNS: 85-xxx-xxx-48.ip.kis.lt

 

yes, rDNS and HELO have to match.

 

Spoke with internet provider, he can't change PTR record, it's automatic for all users, so my server rDNS will be 85-xxx-xxx-48.ip.kis.lt anyway. Is there another way to make Helo same as rDNS without server renaming to 85-xxx-xxx-48.ip.kis.lt ?

 

the only other way would be making the server send the correct helo then.

 

So i should rename server from nice server.MYDOMAIN.com to nasty 85-xxx-xxx-48.ip.kis.lt ?

 

you only need to change the helo setting within postfix.

Code:

postconf -e smtp_helo_name=....ip.kis.lt
maybe aswell
postconf -e myhostname=....ip.kis.lt
postconf -e smtpd_banner=....ip.kis.lt

and reload postfix after

 

tried this:
postconf -e smtp_helo_name=....ip.kis.lt
quality result was 1.2/10 because "we can't find any email server here:....ip.kis.lt (no A record)"

 

dang, right ... didn't think of that well this is nothing you can change unfortunally

 

Anyway, 8.8/10 is not bad result as well i think

 

You can overwrite the hostname in the master.cf by adding " -o myhostname=anything.you.want" to any service.
The default for smtp_helo_name and smtpd_banner is myhostname. There is no need to change various values.