How to upgrade postfix in zimbra

[dangcongphung]

Hi all !
My Mail server is running zimbra (4.5.9), with postfix 2.2.9 . Now we want to use DKIM-milter to sign email. I get some information that smtp-milter is only available on postfix verions 3 and later. Please help me how to upgrade version of postfix .
Thanks all

[phoenix]

Originally Posted by dangcongphung

Hi all !
My Mail server is running zimbra (4.5.9), with postfix 2.2.9 . Now we want to use DKIM-milter to sign email. I get some information that smtp-milter is only available on postfix verions 3 and later. Please help me how to upgrade version of postfix .

The simple answer is, you can't upgrade just Postfix. You'd have to upgrade to the most recent version of Zimbra and as a matter of urgency you should do that as soon as possible (there have been a couple of security announcements about older versions), the version you're currently using is no longer supported.

DKIM signing isn't actually implemented in Zimbra yet, see this RFE: Bug 11524 – DKIM/DK signing support in Amavisd - If you wish to see internal & external mail use DKIM the try the openDKIM instructions on this blog page:How to get DKIM (DomainKeys Identified Mail) working with Postfix on RHEL 5 / CentOS 5 using OpenDKIM – Steve Jenkins' Blog (although as of this posting the site seems to be down for some reason ) - you might find that useful when the site is up again.

[soba@ukw.edu.pl]

DKIM section can be added in amavisd.conf, but I do not know if the Zimbra amavis it supports.

Amavisd + DKIM: http://www.ijs.si/software/amavisd/a...docs.html#dkim

[dangcongphung]

DKIM support isn't in Amavis until 2.5.3, but is more fully supported in the
2.6.x series. My Mail server is running zimbra (4.5.9), which version I can upgrade to ? Pls give me help link to do .
Thanks all

[phoenix]

Originally Posted by dangcongphung

2.6.x series. My Mail server is running zimbra (4.5.9), which version I can upgrade to ? Pls give me help link to do .

Please read the Release Notes on the download page for details of which versions you can upgrade (details are always provided in the Release Notes), you should also search the forums for further details on upgrade paths.