In this post you’ll learn how to test SMTP authentication with StartTLS from the command line. Test TLS connections and SMTP AUTH from the Linux and Windows command line They use X.509 certificates and hence asymmetric cryptography to assure the counterparty with whom they are communicating, and to exchange a symmetric key. Transport Layer Security (TLS) and its predecessor, Secure Sockets Layer (SSL), are cryptographic protocols which are designed to provide communication security over the Internet. SMTP Authentication, often abbreviated SMTP AUTH, is an extension of the Simple Mail Transfer Protocol whereby an SMTP client may log in using an authentication mechanism chosen among those supported by the SMTP server. SMTP Authentication is the mechanism by which the clients of an ISP identify themselves to the mail server through which they intend to send email. 3.2 Check SSL certificate expiration date SMTP Authentication
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