TransportRoles\data\Queue Mail.que large size

Question, I have 8 exchange 2013 servers and 3 of them have very large (50-60GB) Mail.que files in the TransportRoles\data\Queue folder. The other servers are around 20GB in size. I just noticed this so I don't know how fast they are growing, but we haven't had any reports of email delivery issues from anyone in the company. We have been having Memory and CPU spikes randomly throughout the day as of late.

What would you recommend we try? Shut down the Transport Service, move rename the folder OldQueue and wait a few day before deleting the files? Is there anything else we could try? We have circular logging enabled on all our servers... not optimal I understand, but that the way the environment was handed to me recently...

Im up for amy ideas. Thanks in advance.
Christian HansAsked:
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Amit KumarCommented:
Exchange 2013 uses SafetyNet which is the reason for increasing mail queue database in large capacity. Please follow this article

Better not to delete, reduce SafetyNet retention and message expiration times so it can make free space and also allocate good space for Mail queue database. There are certain commands in above article and it is related to other links so you can follow them.
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