--On Tuesday, November 09, 2004 08:43 -0600 Steve Drees <drees@rangebroadband.com> wrote:
I'd suggest having a backup MX but make sure you have all the filtering at your backup that you have at your primary.
Unless you can check for valid users at the secondary, don't do it. Spammers will attempt to inundate you via your secondary with dictionary attacks.
'But the RFC says' these are spammers, they only care about getting their crap onto as many servers as possible. They deliver direct to secondary MX because it'll deal with the bounces for them.