[Exim] Yet another stupid question from me

Hi Guys.

Firstly, thanks for the assistance with the virtual domain problem.

This is another stupid question.

If i have 2 servers, and the first powers down, how to I configure the
second to queue the mail
until the first comes up again, and then forward to the first???

Sorry for the dumb questions, i am a serious newbie

Regards,

Tom