identify MUA connecting?

Juan Pablo juanpablo83 at
Mon Jul 28 17:58:21 UTC 2014

Hello I am using dovecot 1.2.15 on ubuntu.

Is it possible to somehow log the MUA information that is connecting to 

The reason I am wanting to do this is I would like to know if people are 
getting their email on personal devices instead of work secured / 
standardized phones.

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