<mail:outbound-channel-adapter>: 'host' shouldn't be required, when 'java-mail-properties' is defined

For 'java-mail-properties' ref we can use a properties with some posible list:
Here http://www.websina.com/bugzero/kb/javamail-properties.html
and here http://connector.sourceforge.net/doc-files/Properties.html
So, if we define 'java-mail-properties' like this:

[email protected]
mail.smtp.host=smtp.gmail.com
mail.smtp.port=587
mail.smtp.starttls.enable=true
mail.debug=true

adapter config will be very simple:

<int-mail:outbound-channel-adapter id="sendMail" java-mail-properties="javaMailProperties" password="somepassword"/>

And as you can see, there is only one direct property - password.
We can provide some our own 'JavaMail' property 'mail.password' and document it , but I think it will aberration.
Also it is a bug : https://github.com/SpringSource/spring-integration/blob/master/spring-integration-mail/src/test/java/org/springframework/integration/mail/config/MailOutboundChannelAdapterParserTests.java#L86
lines 85 & 86 should be swapped.