After waiting for 2 days for a reply from SUN, this is what I get:
Hi. This is the qmail-send program at [mycompany].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.
<[Somebody]@Sun.COM>:
Sorry, I wasn't able to establish an SMTP connection. (#4.4.1)
I'm not going to try again; this message has been in the queue too long.
Now what are the odds of either a) your web hosting company, that hosts almost 100k domains, has it's internet connection down for a few days or b) sun's mail servers are down ?!
Can it get any worse than that?