@Min(0)
	@Max(65535)
	public int getPort() {
		return port;
	}
Typical options for configuring connection to a mail server. Defines the following properties:
<ul>
<li>host (localhost)</li>
<li>port (25)</li>
<li>username (none)</li>
<li>password (none)</li>
</ul>
extensions/spring-xd-extension-mail/src/main/java/org/springframework/xd/mail/MailServerMixin.java