>From the .qmail file handling the virtualdomain, run a sed script that
would insert the line you want after the first empty line in the
message. Then pipe the result to forward.
Another possibility is this (would be more robust than the previous
one):
Separate the header and the body of the message using 822header (from
the mess822 package) and awk, say. Prepend the body with and empty
line and the line you want to insert, and cat now the new body and the
old header, and pipe the output to foward.
Mate
