amavis user login shell needed?

Dominic Raferd <[email protected]>
Newsgroups gmane.mail.virus.amavis.user
Message-ID <[email protected]> 
On Linux, is it necessary that the amavis user have a valid login shell 
such as /bin/sh? For security I would prefer it to use a null shell.

If it makes a difference, our amavis calls clamdscan with --fdpass (the 
'modern' way). And of course amavis uses SA in the normal way.
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