Not recieveing email from certain domains

Hi,
I am having trouble getting to the bottom of an issue which I have had for a couple of weeks now.
We are unable to receive email from certain domains. The big problem is our sister company no one on there domain is unable to send to any party on our domain, this has only just started happening this morning, however email delivery form other domains has
been problematic for about two weeks now. We are receiving plenty of email form other parties still.
Our sister company is not getting any bounce backs and I have checked the message tracking within Exchange 2008 and I am unable to see any email come in at all from our sister company.
It is worth mentioning that the host of our domain is having a number of issues with "Nameserver" when I check on intodns.com and I'm not to sure if this is the problem or not, however we are currently in the process of transferring away form
them and setup with the same host as our sister company. The transfer hasn't happened yet as our current host hasn't released the tags.
Has anyone got any ideas that can help please??

What's the path from the sister company to your company?
Is it direct? Or does incoming email first transit through some online spam filtering service (like Postini).
Can the sister company connect using telnet?
Here's some very detailed directions:
http://www.port25.com/how-to-check-an-smtp-connection-with-a-manual-telnet-session-2/
And more concise:
http://exchange.mvps.org/smtp_frames.htm
Please mark as helpful if you find my contribution useful or as an answer if it does answer your question. That will encourage me - and others - to take time out to help you.

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