Re: A Good Email Server
Any MTA should do what you want to but some are easier to configure than others. My preference would be either Postfix or Exim.
If you want to secure the connection between the MUA (client) and MTA (server) then configure it to accept SMTPS/TLS connections, this will secure the transfer between the two.
To be able to then transfer the email from your MTA to the destinations MX server securely depends on the server they use. I think by default if Postfix detects that the remote MTA supports TLS it will issue the STARTTLS command and transfer the email securely over a TLS connection, but this all depends on the ability of the far end to accept a TLS connection.
If all you wanted to do was encrypt email in transit then the above would solve your problem.
To then be able to receive email you then need to run an email server such as Dovecot. You can then use POPS or IMAPS to retrieve the email securely.
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