What is the SMTP AUTH command?
The ESMTP AUTH option provides a means of remote clients authenticating to the SMTP service in order to obtain higher privileges on the server such as the right to relay mail through the server.
4 different types of authentication are supported: LOGIN, MD5, CRAM-MD5 and PLAIN. Any mixture of these types can be supported on any server, and both inbound and outbound authentication is supported.
Inbound authentication is enabled under the Incoming > ESMTP page, while outbound authentication is enabled under the Outgoing > ESMTP page.
The AUTH command is defined in RFC 2554.
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