Postfix smtp_mx_session_limit

[Cheech]

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PRODUCT, VERSION, OPERATING SYSTEM, ARCHITECTURE
Plesk 10.4.4 Debian Squeeze x64
PROBLEM DESCRIPTION AND STEPS TO REPRODUCE
i add the smt_mx_session_limit to my main.cf and reloaded and restartet postfix but wehn ich check with postconf -d it is still set at 2
ACTUAL RESULT
checked all dokument about postfix and all say set smt_mx_session_limit = Value and it is working after a reload, but it didn't
EXPECTED RESULT

ANY ADDITIONAL INFORMATION
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My customer want to send emails to his customer there have more as one mx record but postfix is using always the one with the highest prio.

settings main.cf:
smtp_mx_session_limit = 5

settings master.cf:
smtp inet n - - - - smtpd
-o smtp_mx_session_limit=5

I find out that some admins configure more as 1 mx record but only one is real the others are fake to get so much spam emails, like 3 mx records 1=fake, 2 real , 3 = fake and the most bots trying the 1st and 3rd but never the 2nd.

Would be nice when someone can help me out here i search for all postfix folder and files and checked all but i don't know where postfix get the value of when i set 5

thanks in advanced

Marcus

 

[Cheech]

update!

So i found out something....

I have one hostname but 2 IPs on my system.

When i using an email account from my primary ip address i can send email to this special address when i send a email from a account that is configured on my 2nd Ip address i get: host mail.****.com[**.**.**.**.**] said: 451 4.1.8 Possibly forged hostname for "MY2NDIPADDRESS" (in reply to RCPT TO command)

But when i'm checking a customer on 2nd IP and one of my domains with 1st IP on mxtoolbox.com everything is fine.

My customer told me that their sending everyday an email to their customer but onyl since this week their have issues.

The only changes i did is to installed Plesk 10.4.4, so i think something is now wrong with my system but i can't find it.

regards
Marcus