I also have problem with sending an email. I tried to send it to my other email, and message came-out "An error occured while savings". Somehow, when "An error occured while savings" came out, the compose page didn't change. It should go back to inbox page after sending, right?
First, I didn't expected it went through, because was an error. Then I kept trying by change the SMTP setting on Configuration and the error message still came-out. However, I checked the email that I sent (while it still errors), it went through. I end-up with getting 5 same emails from my self

. Now I got more confuse.
Please help for this trouble. I send you as well the log file.
Thank you.