[S-mailx] MTA alias targets

[Stephen Isard]

Hello Steffen,

There was time when (ancestors of?) s-nail would dependably expand a 
plain username to username@hostname, where hostname was the machine or 
domain that you were sending from. If I run s-nail locally, with mta 
defaulting to /usr/lib/sendmail, I get that behavior - maito to myname 
gets sent to myname@localmachine.

And I have access to a machine running the ancient mailx 12.5 where the 
(obsolete on s-nail) variable smtp is set to "smtp.mydomain" and a 
message to myname successfully gets sent to myname@mydomain.

However, with s-nail and an account where I am logged in as 
myname@mydomain, with the mta variable set to "smtp://smtp.mydomain", an 
attempt to send to myname gets me "user name (MTA alias) targets are not 
allowed".  I've tried some experiments with expandaddr and smtp-hostname 
without success.  I don't actually understand the man page sections 
about them.

Is there some setting that will allow MTA alias targets when using an 
smtp server, as on the mailx 12.5 machine?

Thanks,

Stephen Isard