Update:
Ok, after failures all day, the email finally went through in the evening.  I have no clue as to why.
So, I hardly know how to approach this erratic problem.  I do not know what to look for being that it is erratic like this.
Scratching my head.

Update 06/08/2015:
I have not been able to send.  The error in the post above means that there is something wrong with my Claws settings?  It comes after "STARTTLS".  Any idea what I can look for in my own settings?  Claws is able to connect to serve and download all incoming email.  I am only having a problem with sending.

Thanks in advance!


Update #2 06/08/2015:

I decided to check my router settings.  As I went through the security settings, I remembered checking the "Anti-Hacking" checkbox a few weeks ago.  I removed the checkbox and the email sent.  I caused my own problem.  Doing too many things at once, otherwise I would have remembered the change I made immediately.

I really, really like Claws, and Ruggedinbox.