<b>$SMTP_PORT</b> - Automatically determined SMTP server port (like 587) taken from the mail server configuration
<li><b>$SMTP_TYPE</b> - Either <tt>SSL</tt> or <tt>plain</tt>, depending on your mail server configuration
<li><b>$SMTP_SSL</b> - Either <tt>yes</tt> or <tt>no</tt>, depending on your mail server configuration
<li><b>$SMTP_ENC</b> - Either <tt>password-cleartext</tt> or <tt>STARTTLS</tt>, depending on the mail server config.
</ul>

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