Brian Candler wrote:
You may be running into a gray area in your particular case -- a similar question was posted on the qmail mailing list something and the answer went something like this:But I think you're still supposed to try them all: just because you can't reach one server with MX priority 0, doesn't mean you should ignore all other servers at the same priority level. It just means that the recipient doesn't want one machine to take all of the load at the expense of the others.
There's usually a difference between a site that doesn't respond and a site that simply refused to connect. Assume a site with two MX's. If the first MX answers but refuses the connection, many SMTP clients will not try the second MX. If the first MX doesn't answer, they are supposed to try at least one more MX. I suppose the first thing to do here is use telnet to connect to each MX and determine what you're getting as a response (telnet connection error vs. 220) and whether the MX is responding to HELO, etc.
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