[SM-PLUGINS] Include posting guidelines in welcome message upon new list subscription

[Alan in T. <Ala...@pu...>]

There seems to be a bumper crop recently of unclear posts requesting help
with virtually no details about the users' setup. Many times someone
responds, directing the poster to the posting guidelines.

I have a suggestion: why not include the posting guidelines in the welcome
message that each new list subscriber receives? Everyone must first
subscribe before they can post, so this way it's assured that everyone has
at least seen the posting guidelines.