Exchange Receive Connector Temporary Server Error. Please Try again later. PRX4

Hi ,
I installated Exchange server 2013 on Windows 2012 R2 Servers..
Topology ;
1 Active Directory Server : Windows 2012 r2 all updates installed.
1 Exchange 2013 Server : Windows 2012 r2 all updates installed.
I configured send Connector settings and I checked Receive connectors Default Frontend Exchange settings. Anonymous users is ok and don't have any problem.
When I send mail Exchange -> Internet mail goes. this is ok.
But when I send mail Internet -> Exchange I am getting this error ;
Message or connection acked with status Retry and response 451 4.4.0 Primary target IP address responded with: ""501 5.5.4 Required arguments not present."" Attempted failover to alternate host, but that did not succeed. Either there
are no alternate hosts, or delivery failed to all alternate hosts. The last endpoint attempted was xxx.xxx.xxx.xxx:2525
telnet results are below ;
220 exchange.bulut.email Microsoft ESMTP MAIL Service ready at Tue, 30 Dec 2014
14:12:19 +0200
EHLO bulut.email 250-exchange.bulut.email Hello [xxxxxxxxxxxxxxxxx]
250-SIZE 37748736
250-PIPELINING
250-DSN
250-ENHANCEDSTATUSCODES
250-STARTTLS
250-X-ANONYMOUSTLS
250-AUTH NTLM
250-X-EXPS GSSAPI NTLM
250-8BITMIME
250-BINARYMIME
250-CHUNKING
250 XRDST
MAIL FROM:[email protected] 250 2.1.0 Sender OK
RCPT TO:[email protected] NOTIFY=success,failure 250 2.1.5 Recipient OK
DATA354 Start mail input; end with <CRLF>.<CRLF>
Subject: Test from Contosoa
This is a test message
451 4.7.0 Temporary server error. Please try again later. PRX4
QUIT 221 2.0.0 Service closing transmission channel
Thanks. Regards.

Hi,
If the CAS and MBX servers are collocated on the same server the SMTP Receive connection for the Transport service will listen on 2525 instead of 25. This is because two services (FET and Transport Service) can’t listen on the same port.
Refer from this article:
http://blogs.technet.com/b/rischwen/archive/2013/03/13/exchange-2013-mail-flow-demystified-hopefully.aspx
Please try to create an endpoint for 2525 on default receive connector to test mail flow by the following steps:
EAC -> mail flow -> receive connectors -> Default EXCHANGE
Click Edit then click scoping tab.
Under Network adapter bindings, click
add button to create port 2525 for all available Ipv4/Ipv6 addresses.
Best Regards.

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451 4.7.0 temporary server error. please try again later. prx4

Hello,
in my environment i can send/receive mail.
When doing some checks i will end up with this error :
451 4.7.0 temporary server error. please try again later. prx4
I have tried the following without results :
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What do do, to fix this issue?
Thx

Hello,
Please use dcdiag command to check if all DC run normally.
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Error Message "Network Error Please Try Again Lat...

Hi,
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Exchange Receive Connector Temporary Server Error. Please Try again later. PRX4

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