Postfix Courier Postfixadmin MySQL (OPENRELAY)

[Rooney]

Hi All,

I have followed this guide to the letter and it seems to work perfect other than one major factor it leaves the system as an open relay, does any one know the best way to secure this.

the guide mentioned above

http://gentoo-wiki.com/HOWTO_Setup_a_Virtual_Postfix/Courier_Mail_System_with_PostfixAdmin

[Soynuts]

What does your /etc/postfix/main.cf file look like? You can do grep -v "#" /etc/postfix/main.cf to spit it out without the comments.

[Rooney]

I got my self confused it does actually work fine and is not an open relay, i have a block of 8 ip address so i was connecting to the mail server from one of those to emulate an external connection but i hadn’t realised the rule in the main.cf file "permit_mynetworks" will actually identify my /29 subnet as local network and that’s why i though i was open, but i have now remoted to a true external box and tried to relay mail from the server and it is locked down.

The only other problems I have now is mail isent coming in and postfixadmin doesn’t seem to automatically create the maildir’s I have to create these manually and change the permissions manually.

[Soynuts]

I used to have that problem. It ended up me not having the right uid/gids pointing to my postfix user in main.cf that owns my /var/vmail directory where I store all my virtual domain mail (if you have a different user that owns your vmail dir, then make sure you have the uid and gid variables pointing to him and his group). Are you able to su to your postfix/vmail user and do maildirmake user? If you are, then that means you have a uid or gid incorrect in one of your configuration files.

[Rooney]