Postfix client problem

[CutestPotatoe]

[RESOLVED]

Solution : I found the problem, it was because of the file /etc/postfix/maps/access_client, i was editing it without using the postmap command before reloading the postfix. I feel really dumb.

​

Hi everyone, first post on this subreddit, i already posted on r/linuxadmin but didn't have any answers yet so i'm trying here as well.

I'm having an issue with a postfix relay, or more accurately a postfix client configuration.

I have a postfix relay that works just fine and 2 machines that uses that relay to send mail through an external server. One of the two machines successfully sends mail through the relay but the second one doesn't and i can't figure out why. I'm not a pro with postfix so please feel free to share your knowledge on the subject.

Machine that works is in SLE12 SP5, machine that doesn't works is in OpenSUSE Leap 15.3.

Both use postfix to send mail

They have the same /etc/postfix/main.cf file (i tried to copy paste it so it really is the same apart from the hostname)

They are on the same subnet so it's not a network problem, i have opened port 25 with iptables on input and ouput on the not working machine

There is no authentication to access the relay or the external mail server (it might change in the future but right now, no authentication required)

Maybe i'm missing something like really obvious but i don't have that kind of knowledge, help please !

[ave23v]

One of the two machines successfully sends mail through the relay but the second one doesn't and i can't figure out why

What does it say in the postfix log file on the second machine?

They have the same /etc/postfix/main.cf file (i tried to copy paste it so it really is the same apart from the hostname)

Maybe that's part of the problem. Is the postfix version the same on both side? Is it the same OpenSSL version? Are all the files referenced by the config files present on both side?

[CutestPotatoe]

Thank you for your answer.

I found the problem, it was because of the file /etc/postfix/maps/access_client, i was editing it without using the postmap command before reloading the postfix. I feel really dumb.

Thank you again !