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Anti spam is rejecting mails - how to fix it

By gorenjc ·
Situation:
1xWindows server 2008 r2 AD, DNS server
1xExchange 2010, mailbox, client access, hub transport
1xHub transport
We have the outside mail ISP mx-record mail.domain.com

Problem:the send mail is rejected on the server which antispam check
"Client host rejected: cannot find your hostname, (IP of te internet line)"

I've identified the problem is that In the mesage contains 2 different IPs
mx mail.company.com and
IP of internet connection exchage is connected to

Ive checekd:
Ive checked dns mx record
nslookup resolves mail.company.com to mx IP

mxtoools verify the setting of internet provider seeems to me ok.

EMC - Organisation configuration - hub tranport - send connector
network is set use DNS mx

I think I understend what is the problem but cant figure out what's is missmatched - to solve it.

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