Hello:

I have been receiving a "mailer-daemon" reply when I try to send emails to addresses ending in a specific domain (in this case it is 'microplay.ca'). The error message is this:

Hi. This is the qmail-send program at yahoo.com.
I'm afraid I wasn't able to deliver your message to the following addresses.
This is a permanent error; I've given up. Sorry it didn't work out.

<******@microplay.ca>note: I edited address for privacy)
Connected to 207.96.250.22 but connection died. Possible duplicate! (#4.4.2) I'm not going to try again; this message has been in the queue too long

The domain name is related to my business. I have spoken both with my Head Office and also with my provider (Rogers), and both believe the problem lies with outlook. I can send email to addresses ending in microplay.ca if I use Rogers web mail. I have tried using Outlook 2007 on a laptop I own, and it will not send to microplay.ca either. All other email seems to work fine. However, I can receive mail from microplay.ca addresses; I just can't send it to them. I am at a loss on how to proceed. How can one single domain mess things up? It worked fine for years and then just stopped.