add a parameter to specify an SMTP port number to override default
background:
 - Amazon (may be) throttling traffic on port 25 with their SES leading to connection timeouts for ERT
 - They advertise other ports which are not throttled, but specifying a parameter is required to use them
remove unneeded javadoc
Merge pull request #7 from Cru-Tech/smtp-port-param

add a parameter to specify an SMTP port number to override default