[courier-users] Re: Automatically use secondary MX host if primary fails

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Jay Lee writes:

> It's my understanding that Courier would defer the message for awhile
> after the 4xx (which is exactly what a 4xx error is asking it to do) and
> then re-evaluate the MX records. So if there were two mx records of the
> same weight, it would eventually try the 2nd one. In other words, I
> don't believe Courier "caches" the DNS lookup between attempts but I
> could easily be wrong on this. Sam?

Mostly true.


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