Zitat:Plugin: Random Post on Registration
Update from mybb 1.4
Works for 1.4, 1.6 and 1.8

Random welcome message on registration 
This plugin will post a message every-time a new user joins your forums.
The message will be posted in a forum that can be chose from the AdminCP, by a user that can be selected from the settings.
There are 3 different subjects that can be created by the admin and also 3 different message bodies that can be filled by the admin.
The messages and subject will be posted randomly giving the impression that there are not automatic but posted by a person.
A total of 9 different combinations will be  generated.

The plugin can be modified to add more messages or more subject lines.
The plugin is free, in the limits of the license.