At midnight our time last night (GMT+7) our SMTP gateway effectively stopped.
The log reported that traffic was blocked due to Skype (see attached log).
We had a general rule to block skype in IM/P2P. To resolve this, we needed to disable the rule, as the incoming port was any, and so could not create an exception.
Surprising that Skype blocking could block SMTP traffic?
I presume it was a new pattern version that did this, as the IM/P2P rule had been in place for about 3 weeks.
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