It would be helpful to be able to have parameters that
are replaced on a per-log event basis on the Subject
line for the SMTPAppender.
I have multiple web servers running a .NET web service
and all use log4net. When an error occurs, they use the
SMTPAppender to notify me. It would be very useful to
include the host name of the sender in the subject line
so that I could easily determine which web server had
an error instead of having to look into the email.
In thinking more about this it could either be the
Subject line or the From line that has replacable
parameters. Perhaps even make it so that these
properties can use the <layout> tag.
Jeremy Wiebe - jeropa