Email Receiving problem with in the Domain/Organization

Hi.

We are a small business group using hotmail  email service from last 1 year. Till yesterday  11 AM everything was fine, but from 11 Am on wards

we are facing a different problem with hotmail/outlook.com service.

1 we are able to send e mails to external email-ids ( eg: from hotmail acount to gmail account)

2 and we are able to receive the emails from external ids ( eg: gmail to hotmail)

3. But we are not able to send or may be receive hot mail to hotmail .

I have tested the problem as below.

sent a test mail to ten internal email ids with cc to external email ids. External people have revived the mail, but no internal people.

and the extrenal people replied the test mail, which are recived by internal people i.e hotmail accounts. but we are not able to find why there is a problem from hotmail to hotmail.

Our domain is @springforthcap.com

My mailid id  is *** Email address is removed for privacy *** 

Please helps us. Even I am not able to receive the mails from community forum.

Please reply soon.  I am able to receive  mail from other domains but not from self domain.

I have sent some mails to self-id for testing purpose, but did not receive them. sent mails are being saved in sent folders. but not able to receive them. Can any body help me solving this problem