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Alex Charrett wrote: | | You'd be surprised what a high volume of mail doesn't reach the most | preferred mail exchanger first time, so that it's either sent off to the | next highest MX or held for a retry later. I'd guess that it's 20%, | others may have other ideas.
We looked at backup MXes, and decided not worth retaining unless the backups have a list of all the mailboxes, just makes spamming easier. Ever look at the mix of that 20%?
Sure most of my email at work is delivered in a few seconds, but if some spammer decides today is a good day to try another dictionary against our email servers, and 10,000 PCs all start trying different bits of the dictionary, I'm not guaranteeing any response for an email, or indeed any response other than "Connection Refused" or "Connection Timed Out".
Judging by my recent email logs, none of Verizon, BTConnect, Hotmail, and a fair few others, manage to maintain even vaguely reliable acceptance of incoming connections (although through massive redundancy hotmail usually gets there eventually). Without throwing specific hardware like hardware RAID, or flash disks, or clustering, at a mail server you are pretty much doomed to short periods when you refuse connections, and for most cases this is acceptable level of performance. -----BEGIN PGP SIGNATURE----- Comment: Using GnuPG with Debian - http://enigmail.mozdev.org
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