Hi!

I have a couple of domains using email on domains.live.com. One of these, www.nihas.org has suddenly stopped receiving emails. There cannot be a question of incorrect MX records as I have been using it for a long time now and it was working fine until today. There are no blocked lists, no filters, nothing wrong of this sort! I have even created a new account on the domain and used it to send emails to Gmail, Yahoo Mail!, both. Every time the email from ****@nihas.org is received by the Gmail/Yahoo Mail account but when I reply to it, that does not reach back. 

The reply-to address is also correct and additionally, I have already tried sending a mail directly (without using the 'reply' option!).

Can anyone help me with this? Really at a loss!