[horde] SMTP Auth Help Needed

[Kirk Bankes]

I'm looking for definitive instructions on getting SMTP auth to work on 
the latest Horde and Imp platform.  I've tried the bits and pieces of 
help (enabling auth) on the mailing list archive, but no luck.  I keep 
getting (sendmail return code 78) when I send the mail.  Everything else 
is working great.  My sendmail server also works properly and 
authenticates.  Thanks.