There are two minor problems in given command examples in Mail subsystem sections in configuration guide:

1) In section Configuring SMTP server for use in an application second command has different name of mail-session item, therefore it should be:

/subsystem=mail/mail-session=mySession:add(jndi-name=java:jboss/mail/MySession)

1) In 10.2. CONFIGURING CUSTOM TRANSPORTS the third command has extra space in it:
outbound-socket-binding-ref= my-smtp-binding -> outbound-socket-binding-ref=my-smtp-binding