I know that this indicates a serious problem.
Yes, when you have thousands of E-mails backing up, it is a serious problem.
The first step is to determine your daily volume of mail. Are these servers handling thousands of E-mails per day or hundreds of thousands? That will help determine whether the backup is expected (in which case you can work on ways to increase the load the server can handle), or whether there is a problem that needs to be solved (such as DNS issues). If your server received 100,000 E-mails yesterday with no problems and today it received 105,000 E-mails with huge backlogs, something probably happened between yesterday and today that caused the problem.
Then, you need to check your log files. For example, if every 4th or 10th log file entry is an error message, well, that's important. You'd be surprised how many people overlook such things.
Then, take a look at the server resources. Is the CPU usage at 100%? If so, what program(s) are using the high CPU usage?
-Scott
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