If IE will translate %l into an email address and pass it to
the exe program you specify than here one method that may work:
There is a perl script on the YIRX page called, souppost.pl that
puts a text file in yarn's REPLIES.ZIP file if you specify the
message header. The command:
perl.exe souppost.pl -nFilename -t%l -sSubject -fYourAddress
will put the text in Filename in yarn's replies soup packet with
the mail header:
To: %l (or its translation)
From: YourAddress
Subject: Subject
So if you specify the above as the exe program, and use the same
tmp file to create a message in any old windows editor, you should
have the equivalent of Yarn's sendmail. You can then send out the
Replies packet any way you usually do it. In effect, this perl script
is designed to send out a message, in Yarn's way, with the header
specified on the command line.