>Suddenly, our queue is stacking up with undeliverable mails (few hundred
>overnight). Below is a snippet of log file which is typical showing MX
>connect fail or Stack Connect fail....
>05:20 07:22 SMTP-(00000308) Stack connect fail "68.1.17.7"
>05:20 07:22 SMTP-(000005B4) MX connect fail "64.4.55.71"
>05:20 07:22 SMTP-(0000058C) MX connect fail "64.4.56.135"
>05:20 07:22 SMTP-(00000790) Stack connect fail "64.12.187.25"
>05:20 07:22 SMTP-(0000015C) MX connect fail "66.218.66.208"
These are the only 5 lines from the log files that indicate anything
useful. The rest were just stray lines that by themselves don't have a
bearing to this problem.
So what you have is 5 IPs that are down or unreachable. They look to be
mostly Hotmail IPs, it is probably an issue on their end.
If it is happening for quite a few other domains, there could be an issue
(IE a routing problem). But if it is mostly Hotmail, I wouldn't worry.
-Scott
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