SMTP Error: The following recipients failed: error


I have been testing e-newsletter and have the following issue.

I have entered a fake email address as per title above via the members tab in admin.

After creating a newsletter, I have selected the group where this email resides and proceeded to send.

I expected e-newsletter to send a copy to the fake email address which would bounce and then be processed as such.

However, upon sending the newsletter, all is processing fine until it tries to send to the above non existent email. At this point the sending stops with the following pop up error;

SMTP Error: The following recipients failed:

I click OK in the pop up and the progress bar remains static.

The only option is to cancel the send leaving many of the remaining messages unsent. It will not continue to process and send to the remainder of the group beyond this entry.

Please could you advise urgently