Exchange 2013 throttling while sending

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I have two exchange server 2013 configured as DAG one of the two server the Passive one is causing mails to stuck in the Queue i have around 7000 mail in the queue and mails continue to grow my environment is hybrid with exchange online but mails goes directly to the internet. 

1 Reply
What does the "LastError" say in
Get-Queue <Server>\queue | fl
Regards
Andres