administrator permissions mail server

Hi everyone,

I am sorry if this is not the exact forum to post this question but seemed
the most relevant.
I am working in a network with 40/50 PC's managed by 3 people with
administrator passwords.
The OS used is GNU/Linux.
There is also a webmail service provided by the same server, which is also
maintained 
by the same people.
My question is the following:
Since the administrator has of course access to all user files, does this
mean that 
one with administrator privileges can read everybody's emails? 

Cheers,
step0ut
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