Each letter that passes through the mail service has its own identifier, or in other words, a unique letter number. Exim queue message identifiers are upper and lower case alphanumeric sequences such as 1TrXS1-0003SL-3h and are used by most Exim queue administration and logging commands.

    Exim is a Mail Transfer Agent, a messaging agent or mail server used on many Unix family operating systems.

    Let's look at a short list of ssh commands to control the mail and mail queue. All commands must be executed from root

    Output the number of messages in the mail queue (what we see in monitoring)

    exim -bpc  
    

    Print list of messages in queue. Outputs, queue time, size, message ID, sender, recipient

    exim -bp  
    

    An example of such a list

    4h 791 1TrXgs-0004t8-0W ####@#########.com  
    
    4h 1.8K 1TrXgu-0004tZ-5w  
    ####@#########.com
    

    Accordingly, the identifiers of these two messages: 1TrXgs-0004t8-0W and 1TrXgu-0004tZ-5w

    Delete the message from the queue

    exim -Mrm [id]  
    

    (Example: exim -Mrm 1TrXgs-0004t8-0W, will remove the message with the passed id from the queue)

    View message headers

    exim -Mvh [id]  
    

    View the message body

    exim -Mvb [id]  
    

    Viewing message logs

    exim -Mvl [id]  
    

    Delete all blocked messages in the mail queue

    exipick -z -i | xargs exim -Mrm  
    

    Delete all messages from the mail queue where the sender domain

    exipick -f @domain -i | xargs exim -Mrm  
    

    Remove all messages from the mail queue where the recipient domain

    exipick -r @domain -i | xargs exim -Mrm  
    

    Remove all messages from the mail queue

    exipick -i | xargs exim -Mrm  
    

    If there are several hundred thousand messages in the queue, it is faster to delete the queue with the

    rm -rfv /var/spool/exim4/input/  
    rm -rfv /var/spool/exim4/msglog/  
    

    If you have not installed Exim a postfix on the server, you can use the following commands
    mailq output mail queue

    postsuper -d ALL  
    

    cleaning up the mail queue