On Fri, 9 Jul 1999, David McCall wrote:

> Below is the errormessage:
> 
> 
> Jul  9 08:07:46 nbcls sendmail[18610]: IAA18607: SMTP MAIL protocol
> error: 501 <
> nobody@nbcls>... Sender domain must exist

Your mail server is saying MAIL FROM:<nobody@nbcls>

nbcls is an invalid domain.  Find out why the mail server is doing that.

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