ssmtp with multiple email accounts

[Gary]

I can't be the only one who has this, so I'm wondering if I've missed
something really simple.

Like many people I have multiple email accounts and would like to send
from all of them using mutt. I currently use ssmtp to deliver to the
outside world. The problem is that the config is different for each
email account. How can I automatically make ssmtp aware of, for
example (starting with something pretty basic), which AuthUser it
should use to send a specific email? I found
http://sourceware.org/ml/cygwin/2003-03/msg01075.html which is part
ofthe way there but it looks like the scripts require some kind of
manual intervention.

Thanks.

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