> If that temporary problem lasts a few extra seconds, the attempt to the 2nd
> mailserver can fail too, causing the remote mailserver to hit the 3rd mailserver.
If I had two different servers at two different locations (and feeds) both tank simultaneously, I'd probably have more problems to worry about than spam. :-)
I think you misunderstood.
I wasn't saying that there was a problem with *your* mailservers. I'm saying that if I send you an E-mail, the same problem that could cause me to go to your 2nd mailserver (a temporary connection problem on my end preventing me from reaching your 1st mailserver) could easily cause a problem reaching the 2nd mailserver (but successfully reaching the third).
Let's say my Internet connection is out for a minute. My mailserver tries your primary, and times out after 30 seconds. It then tries the secondary, and times out after 30 more seconds. It then tries your 3rd mailserver, which it is now able to successfully connect to.
Seriously, my backup servers (everything but the primary) are located in my house, so I keep a pretty close eye on them. If the second server ever went down, I would likely be 10 feet away and could closely monitor any traffic hitting the third server.
The issue isn't an issue on *your* end. The issue is an issue on the remote end.
-Scott
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