Outlook Express can be configured to use TLS to authenticate with an email server and to transmit messages securely, i.e. in encrypted form between Outlook Express and the server set to be its SMTP server. Note: TLS doesn't gurantee end-to-end encryption of the message, just the encrypted transmission of the message from the client email program, such as Outlook Express, to the SMTP server to which it hands off the message. That server may in turn transmit the message to other servers in unencrypted form.
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