Nathan Ward wrote:
Most fly-by-nighters tend to have 3 or even 4 MX records, with little purpose.
Yeah, mostly because naive advice is often given (usually by consultants that don't know any better) that, "you need a backup MX". Never mind that the backup MX isn't going to do anything that any semi-sane sender's MTA isn't going to do. Never mind that the only people with non-semi-sane MTAs are sending spam and malware. Or that the backup MX may have configuration differences which can lead to interesting (read: nasty) surprises. I figured out mumbleteen years ago, as rata.vuw.ac.nz's mail queue filled its disk partition *again* with umpteen copies of all the mail coming through the Novell mailing list (one of the highest traffic mailing lists back then) that wasn't going to be delivered that weekend because something had broken at a downstream site, that dumb secondary MXs are a very bad idea. I've always advised that if a secondary MX host isn't going to do anything useful with incoming mail other than re-queue it for delivery, then just don't bother. -- don