Zimbra Server - can receive email but not send

I need to connect to a Zimbra Server for secure email - I can receive email but not connect. I get a connection refused error for sending email.
I am using a G4 mac, Mac Mail, OS X 10.4.11, AT&T dsl service.
Can anyone tell me what settings need to be changed to make the connection for outgoing email?
Thanks!
John

I don't have a Zimbra server to try to connect to, but I see directions for setting up Zimbra for Mac's Mail elsewhere, like near the bottom of this page...
http://its.lafayette.edu/help/email/zimbraclientupdate
I see this one uses Port 465, which is different than the last one I checked.

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Zimbra Server - can receive email but not send

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