I have an on prem 2013 exchange server and we are using microsoft exchange online protection. Mail is flowing, but once a week Mail will stop flowing and get stuck in pending in the EOP mail flow. An on prem server reboot will allow mail to start flowing again, but it is very slow. takes about an hour to send 20-30 messages after reboot. Not sure what the problem is. I spoke with microsoft and they checked the settings and said it was configured correctly. Any help is appreciated. Thanks!
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