from what you describe, it looks like outlook.com is blocking emails sent
from the jaws-users.com domain. Email accounts ending in @outlook.com, @
hotmail.com, @live.com, or @msn.com are powered by Outlook.com.
Here's some relevant info:
We are currently experiencing problems with the following ISPs:
MSN, Live, Outlook and Hotmail.
They are blocking out messages from this domain. They can post to the list but
they are not receiving messages. If those of you who are receiving messages
know members who are being blocked since they are using the above mentioned
services could pass this note along to them and ask if they would contact their
internet providers to un-block this domain that might go a long way towards
resolving the current crisis. People are contacting me privately asking what is
going on and I can’t respond to them as my replies keep bouncing right back.
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