Is there something easy to look at here?
The default settings in main.cf are all 30s  - should some be higher?

I was seeing this error sending to this list as well. 



Reporting-MTA: dns; gate4.touchfon.com
Arrival-Date: Wed,  8 Jan 2003 08:33:20 +0000 (GMT)

Final-Recipient: rfc822; [EMAIL PROTECTED]
Action: failed
Status: 4.0.0
Diagnostic-Code: X-Postfix; conversation with
    nav-gateway.mweb.co.za[196.2.42.10] timed out while sending end of
data --
    message may be sent more than once



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