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encryption of emails

has, or does anybody know, an email-gateway, that encrypts emails 
for example the whole mailexchange between several branches of a 
company? maybe a kind of "black-/whitelist" - all mails to 
users/domains on a list will be encrypted - the rest will be sent 

it is important, that this works automated, serversided and no user 
has to do (forget ;) something!

and: is it possible to store incoming emails encrypted (postfix - 
Maildir), that f.e. no user with local access can read mails of another 
user on the server? when polling this encrypted emails, they should 
be decrypted automatically!

thx for any ideas & tips!


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