As a follow up..
I googled this and various answers were to try different ports.
I tried 25, 26, 587 and 465. All to no avail.
Send Error from log file::
java.lang.RuntimeException: Empty writer returned: 503-All RCPT commands were rejected with this error:
503-503 sender not yet given
503 Valid RCPT command must precede DATA
at anywheresoftware.b4a.net.SMTPWrapper$1.run(SMTPWrapper.java:248)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:441)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:305)
at java.util.concurrent.FutureTask.run(FutureTask.java:137)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1068)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:561)
at java.lang.Thread.run(Thread.java:1096)