Hello all,
I have searched through the forums but still in need of some clarification for this subject:
how may I block the use of SMTP (by mobile and desktop mail clients) for all users except few domains?

I mean I have to allow only few domains to use zimbra auth smtp and leave others to own SMTP services...

As an alternative I would like to simply change SMTP port from 25/465/587 to some other value.

Thanks and regards!

> Release 7.2.3_GA_2872.RHEL5_64_20130304144832 CentOS5_64 FOSS edition.