I'm having trouble sending email through stunnel with our customer service email address.  We use google premium services for our hosted email.  I can send through stunnel using my own personal account, but when I switch to the cust service account, I get the error: 

 "Failed to send an E-mail through the specified SMTP server [127.0.0.1]:  The SMTP server requires a secure connection or the client was not authenticated.  The server response was 5.5.1 Authentication Required."

And yes, I double/triple checked credentials and can login through the gmail interface with them just fine.  I also tried changing the password to a strong password which did not help.  

gmail settings in stunnel.conf:
[gmail-smtp]
client = yes
accept = 127.0.0.1:259
connect = smtp.gmail.com:465

I also tried port 587 but that produces another error:  "Failed to send an E-mail through the specified SMTP server [127.0.0.1]: Failure sending mail."

Any ideas?