exchange 2010

emails from following domains are not coming to my organization.

we have proof point but is not blocked there.

but these ip's are blacklisted as mxtoolbox

since my proofpoint gateway is not configured for mxtool box , what is the reasom emails from these ips are blocked

173.201.192.239
tbrand@tiltedkilt.com

173.201.192.64
adennis@tiltedkilt.com

157.56.111.72
michelle@target-response.com
pramod1Asked:
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Luis MouraCommented:
Maybe this IP is consider spam.
I
Seth SimmonsSr. Systems AdministratorCommented:
if your point of entry for email does not show anything received or blocked from those addresses, then the sender will need to trace it from their server; nothing you can do about it

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pramod1Author Commented:
if some ip is considered spam, emails wont go to other end? can you explain
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