>Another basic thing to look at is if they are using a blackhole list or
>some other spam filter.  Some firewalls will be too aggressive in
>filtering mail that it considers originating from a spam site.

The SMTP 4xx or 5xx from the rejcting MTA will usually be sent before it 
accepts DATA command, ie, before the body.

I suspect he's having a local MTU problem, say with the router at the end 
of his uplink.

Len


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