Trouble relaying smtp

[Tsvi Mostovicz]

I'm quite new at this so please bear with me.
I set up a kolab server at home using version 2.1rc2.
My problem is with smtp, apparently most mail sent from home dyndns entries
is being automatically considered as spam. Therefore I decided to relay my
mail via gmail.
I used this guide:
http://souptonuts.sourceforge.net/postfix_tutorial.htmlto reconfigure
postfix.
I applied the changes to the template files.
But I still keep getting the following message from postfix

Reporting-MTA: dns; ttm.homelinux.net
X-Postfix-Queue-ID: 1F6D98C619
X-Postfix-Sender: rfc822;
tsvi at ttm.homelinux.net <//tsvi at ttm.homelinux.net/>
Arrival-Date: Mon, 28 May 2007 12:04:12 +0300 (IDT)

Final-Recipient: rfc822; tsvi at ttm.homelinux.com <//tsvi at ttm.homelinux.com/>
Action: failed

Status: 5.0.0
Diagnostic-Code: X-Postfix; host gmail-smtp.l.google.com[66.249.91.109] said:
    530 5.7.0 Must issue a STARTTLS command first z37sm7985487ikz (in reply to
    MAIL FROM command)


I'd appreciate it if anyone could help me with this one

-- Tsvi Mostovicz
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