If you manage mail servers running exim, these 2 sites provides useful summaries of the exim command:
Cmds such as:
To remove all frozen messages: # exiqgrep -z -i | xargs exim -Mrm
To remove messages older than 30 days: # exiqgrep -o 2592000 -i | xargs exim -Mrm
(86400 * 30 days = 2592000 seconds)
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