What SMTP server can I use with JavaMail?
You can send up to 1,000 email messages per day through JavaMail using relay-hosting.secureserver.net
as your SMTP server.
NOTE: All hosting accounts purchased after 7/11/2011 do not support Java. Existing accounts with Java enabled are not affected by this update — unless you manually disable Java. Once disabled, there you cannot re-enable Java.