Is there any way to send out auto responses to those who join or unjoin my group?

Answer 1

Favorite Answer

Hope the following helps you:

How do I designate files to be automatically emailed to members upon certain conditions?

A complete list of the files you've set for auto-delivery appears in the Management > Group Settings > Membership area of your group.

http://help.yahoo.com/l/us/yahoo/groups/original/o...

Answer 2

you do this in the file section, create a text file and have it sent to pending members and members who leave.