I am just curious if anyone else has noticed this, what I should make of it, and if anything can/should be done in regards to a rather curious trend I have noticed recently.
I haven't noticed it, but haven't been looking for it either.
I've noticed that a growing number of mailing lists are ALWAYS being sent via my secondary MX, or the MX with the lowest priority. Since my primary has not been down at all, and my MX records are properly set up, this would not only seem to violate RFCs but just doesn't seem like a "legitimate" way to run a mail server.
That is 100% correct. It does violate the RFCs. Worse, it will cause some of the mailing list E-mail to go undelivered (some people think it is funny to have their lowest priority mailserver delete all E-mail).
Unless others chime in that they are seeing this too (with legitimate E-mail -- it's very common with spam), I would guess that there may be some odd sort of issue causing this. I don't see any problems with your MX records or connecting from here, but it may be that there are some parts of the Internet that have sporadic issues connecting to your primary MX record. Or, it could be that there was a problem a while back, and they are "remembering" that the primary is down (although I believe they are supposed to forget after a few hours, or perhaps a day or so, per the RFCs).
-Scott
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