Dovecot *requires* MySQL?

[Bob Bernstein <poobah@ruptured-duck.com>]

Setting out to install dovecot-imapd on a squeeze host via apt-get, 
I discovered that:

The following extra packages will be installed:
  dovecot-common libmysqlclient16 libpq5 mysql-common
    
I understand that neither of the two mysql debs named above provide 
MySQL _server_ function, so why are they needed? I refuse to have a 
MySQL server on (or doing business with) any host for which I am 
responsible. I ma not really happy with that 'client' mysql thingie, 
to be completely honest!

tia

-- 
Bob Bernstein

    I am dissatisfied, profoundly so, with the world as it is. But I 
    would be dissatisfied with any world. And I'd hate to lose my 
    dissatisfaction.

                                       Alfred Kazin