How can i relay through gmail in zimbra

[dovik]

Hello ppl,
Its my first post but been using zimbra for a year now am having a problem with my isp mail server cant send attachment more than 5mb. am using google app.

can somebody tell me its possible to relay outgoing mail through gmail on zimbra, i know its possible to do it on postfix

here is the howtos : Send Mail Postfix through Gmail’s SMTP on a Ubuntu LTS Server

the problem am having is i cant modify main.cf

Any help will be appreciated!

Am using
Release 5.0.16_GA_2921.RHEL5_20090429052155 CentOS5 FOSS edition