I've got qmail set up on a Linux platform to do standard mailing lists. Is there a simple way to append a signature file to all outbound messages from that mailing list, preferably one that uses native qmail features without patching or new code? I'd like to attach a text file that summarizes available lists and who to contact to get on/off my lists. Users will submit plaintext and html-formatted messages to the mailing list...is this an issue?