This looks interesting:  

http://cthayer.wordpress.com/2008/10/03/sendmail-smart-host-authenication-by-s
ender/  

Probably best to check Sendmail docs and touch the cf file and use m4 though
after understanding what is possible.   

http://www.sendmail.org/~ca/email/auth.html
Section:  

Using sendmail as a client with AUTH
  

   

Kelly  
>  Sun Jun 17 2012 04:53:22 PM CDT from "Jeff Jensen" <jjensen at apache.org> 
>Subject: Re: [tclug-list] Configure Sendmail for CenturyLink DSL?
>
>  I've had a couple of private replies, so answering this on the thread.   
>
>  "Why am I doing this"?  Because I have 2 Fedora servers and a few
>services occasionally send email.  Those forwards are going to my gmail
>address.  gmail is not allowing them through most of the time as it looks
>like relay attempts (a la spam approach).  I am not running my own email
>processing with it.   
>
>  Why sendmail vs [other product]?  Only because sendmail was already
>configured and running with default distro, and running flawlessly for about
>15 years.  This problem only occurred because of recent switch of ISPs (for
>speed).  Previous awesome ISP must have configured this behind the scenes.
>
>  Is it really worth the effort to change to something else (2 people's "any
>advice appreciated" is "switch to postfix") that is not installed and
>working?  And if so, is the recipe to accomplish what my real goal is
>readily available?  That's what really matters.... not which product I use.
>   
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