I get the error:

Order Processor (OrderConfirmationEmail) failed due to Bad sequence of commands. The server response was: This mail server requires authentication when attempting to send to a non-local e-mail address. Please check your mail client settings or contact your administrator to verify that the domain or address is defined for this server.. Status changed to (Delayed - Order Under Review)

When a order is submitted.  My server requires authentication.  I've tried multiple settings even putting the username and password in the web.config file.  I did not find anyone else with the problem on the site.  Please help!

Find mailSettings in web.config and update it as appropriate.

<network
  host="host name" 
  port="integer" 
  defaultCredentials="true|false"
  userName="string"
  password="string"
/>

I was able to get around this problem with the following settings. I have a new problem now when the error is placed ( error : ErrorCode: 10501 ) after the order is placed

<network

 host="mail.mysite.com" 

 port="25" 

 defaultCredentials="false"

 userName="username@mysite"

 password="password"

/>

* "mysite" used in place of domain