Configure Microsoft Outlook Express with TLS and SMTP_AUTH.  This is a common issue that can be overlooked by administrators for users who insist on using Outlook Express.  The set up for secure login and sending email is not intuitive. For more information on how to configure Postfix you can consider Postfix Self-Directed Course or ...

Check for TLS Support in Postfix By running this command you can verify that TLS is supported by your version of Postfix.  Each of these parameters should exist. # postconf -d | grep tls lmtp_enforce_tls = no lmtp_sasl_tls_security_options = $lmtp_sasl_security_options lmtp_sasl_tls_verified_security_options = $lmtp_sasl_tls_security_options lmtp_starttls_timeout = 300s lmtp_tls_CAfile = lmtp_tls_CApath = lmtp_tls_cert_file ...

TLS or Transport Layer Security is a protocol that is encrypted and is a close relative of SSL.  Actually TLS has developed from SSL and has backward compatibility.  SSL, Secure Sockets Layer, is a protocol or language that is used to encrypt communication between clients and servers. This type of communication is necessary when ...

If you want to use TLS, encrypted communication between the server and client, you will be very frustrated with Linux options.  Evolution will not recognize port 993 or 995 which are used with TLS.  Thunderbird is supposed to work, but I could never get it to connect correctly.  An excellent option is Zimbra Desktop.  You can download Zimbra Desktop from HERE If you choose to install in Linux you will need to execute the command to install for each ...