2nd qmail-server

[Jan Stifter]

hi all,
i have a qmail-server, which handles mails for a small company. i
would like to setup a second mail-server, with an MX record with lower
priority as the first one, so that if the first fails, the second one
will receive the mails. after the first one is alife again, the second
one should deliver him the received mails.

how could i implement the second server? any comments, RTFM's are
welcome.

jan