Quoting Ben Lutgens (blutgens at sistina.com):
> The mail still sits on that server untill you collect it. In fact, if he
> wanted to the admin could make copies of all your mail.....
> 
> You should think about what you're saying here. Sounds to me like you
> need to setup your own mailserver and route all your mail to that....

But then I can setup a sniffer on port 25 and man-n-middle attack your SMTP
traffic.

Best bet, GPG encrypt.

Next best best, TLS and sendmail. 

http://www.mn-linux.org/members/tanner/presentations/Sendmail+SMTP_AUTH/html/Sendmail+SMTP_AUTH.htm

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