If you have cpanel then you can check email queue in cpanel by login to cpanel and then “Email” and then “Manage Mail Queue.
In command line, you can run following command to check queue
# exim -bpc
If you need the summary of messages in queue then you can run
# exim -bp | exiqsumm
If you want to print message ID in queue then
# exiqgrep -i
If you want to clean mail queue then
# exim -qff
If you want to do debug while cleaning then
# exim -qff -d9
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