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Date: Sat, 20 Nov 2004 19:49:20 -0800
From: Charlie Schluting <charlie@schluting.com>
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Subject: Re: Sendmail, simple mail list problem
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Alan Curtis wrote:
> 553 You are not authorized to send mail as <otheruser@myisp.com>
> 501 5.6.0 Data format error
> 
> So <myaccount@myisp.com> and <myotheraccount@mywork.com> can send mail 
> to the list but not <otheruser@myisp.com>.
> 
> Any suggestions on how to fix this?
> 

Sounds like your ISP published SPF records, and sites that do SPF 
checking are blocking.
This shouldn't happen if you're sending all mail through your ISP's mail 
server... unless you're ..well I don't know.

Not enough info.
Use real domain names in your questions.

This isn't a freebsd question, though.
-Charlie.