[Exim] (how does one ) view all the mail headers in the queu…

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Author: Segree, Gareth
Date:  
To: exim-users
Subject: [Exim] (how does one ) view all the mail headers in the queue.
I tried to view the header by doing the following

exiqgrep -f "<>" -i | xargs exim -Mvh

But get the following *** Only one message can be listed at once
I guess that's because all msg id are thrown at the command.