AutoSupport supports HTTPS, HTTP, and SMTP as the transport protocols for delivering AutoSupport messages to technical support.
Because SMTP can introduce limitations on message length and line length, you should use HTTPS or HTTP for your AutoSupport transport protocol if possible.
HTTP uses port 80; HTTPS uses port 443. If the network connection does not allow HTTPS or HTTP, you need to configure AutoSupport for SMTP.
To use HTTP or HTTPS to send AutoSupport messages, you might need to configure an HTTP or HTTPS proxy.
The AutoSupport daemon requires an external mail host if you use SMTP. The storage system does not function as a mail host—it requires an external mail host at your site to send mail. The mail host is a host that runs a mail server that listens on the SMTP port (25).