I can send email from Exchange 2007. I can send and receive email between the two server (internal).I cannot
send external emails from Exchange 2013. I get this
Diagnostic information for administrators:
Generating server: MBOX-1.xxx.xxx
Receiving server: SRV-EXCHANGE.xxx.xxx (192.168.0.xx)
xxx@gmail.com
Remote Server at SRV-EXCHANGE.xxx.xxx (192.168.0.11) returned '400 4.4.7 Message delayed'
6/9/2015 1:04:20 AM - Remote Server at SRV-EXCHANGE.xxx.xxx (192.168.0.11) returned '451 4.4.0 Primary target IP
address responded with: "421 4.3.2 Service not available, closing transmission channel." 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 192.168.0.11:25'
I have the Exchange 2007 allow the CAS IPs of Exchange 2013.
Exchange 2013/Exchange 2007 Coexistence cannot send external email from Exchange 2013
June 8th, 2015 9:47pm
Is there a firewall between the two servers? Are the two servers in the same Exchange organization?
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June 9th, 2015 9:20pm
Yes to firewall port 25 is open
Same Organization
June 10th, 2015 11:17am
Send connector in-place and configured properly on your Exchange 2013 server(s)? Using a smarthost? More information about your Exchange org is needed to offer suggestions.
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June 10th, 2015 11:38am
Open all firewall ports between the two servers. If it's a Cisco firewall, make sure "SMTP Fixup" and/or "Mailguard" is turned off.
June 11th, 2015 1:21am