Set up a public folder auto-reply according to the above:
1) Created a public folder called Xreplay which has e-mail firstname.lastname@example.org. I can send messages to this folder and they both appear in the folder and trigger the auto-reply.
2) Created a universal security group called X with e-mail email@example.com. I made the above public folder a member.
The only problem is if I send messages to firstname.lastname@example.org (the group), although they are delivered to the public folder the auto reply is not sent!
In folder assistant on the folder the condition is set to all messages and action = reply. I have not selected ANY conditions.