How to secure the content of POP mailboxes?

[Bertrand.Sorez@bull.net]

Hi,

Sorry for my poor English...

Many small (or medium) organisations use, for their needs of public 
mailboxes, a
POP server owned by the ISP instead of a SMTP server in their private network.

It means that a user connects to the POP server located at the ISP, download 
his
mails and cut the connection.

In this model, how can we secure the content of the e-mails?

Tx for the help.

Bertrand


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