We use Cross signature from crossware but I am a big fan of open source software and was surprised to see Mail Signature on OpenNTF by Ulrich Krause .
I desisted to try it out. Mr. Krause explains it very well.
Copy the addin too the root of the domino binary dir and add the following lines to notes.ini
;====== MAIL SIGNATURE START =====
;====== MAIL SIGNATURE END =====
if you change the MAIL_SIGNATURE_DEBUG_LEVEL=0 & MAIL_SIGNATURE_DEBUG_AGENT=0 your console will not get any debug.
everything was working fine after about 10 min work ,just remember to restart server. or reload config
Nice job Ulrich