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A number of people sending us emails report that their emails are being bounced with an error 503. No more information then that in the error. We have no logged SMTP transactions indicating that an error 503 was sent. When does SmartMail reject an incoming email with an error 503? Why is that SMTP transaction...

Bit of an odd one, but I'm writing a program to help us go through the logs our SmarterMail server produces, and I came across this 'oddity'. In the SMTP log, each line begins with the Time, IP address, and a seemingly 'Random' number that identifies the SMTP thread when more than one is happening at...