Sue:

Thanks. I ran the test and you are correct: Out-of-Office recipients
are NOT added to safe senders when "Add Senders" is enabled.

-- Owen

In article ,
says...
I don't think so, but it should be easy enough for you to test.
The "Add senders" feature is a client feature, but the
out-of-office messages are sent not by the client, but by the server.