I have an Exchange 2013 server set up for testing which I am trying to have the internal servers relay off of to EarthLink (My ISP).
The Receive Connector is set up as a FrontEnd Transport, Anonymous and Externally Secured authentication. It accepts all addresses from my internal subnet.
The Send Connector is set up using a Smart connector to smtpauth.earthlink.net. It is set to use port 587 ( which is what EarthLink apparently uses). It uses basic authentication with my credentials to EarthLink. The address space is set to '*'.
When I am on one of the member servers, I telnet 25 to the Exchange 2013 server and testing it:
220 exchange.home.com Microsoft ESMTP MAIL Service ready at Sun, 23 Nov 201
4 08:41:40 -0500
ehlo home.com
250-home.cave.com Hello [172.16.200.20]
250-SIZE 36700160
250-PIPELINING
250-DSN
250-ENHANCEDSTATUSCODES
250-AUTH
250-8BITMIME
250-BINARYMIME
250 CHUNKING
mail from:myaccount@earthlink.com
250 2.1.0 Sender OK
rcpt to:outsideaddr@bigcompany.com
250 2.1.5 Recipient OK
DATA
354 Start mail input; end with <CRLF>.<CRLF>
Hello
Goodbye
.
451 4.7.0 Temporary server error. Please try again later. PRX3
I have been searching all over for some insights what this 451 4.7.0 .... PRX3 error is. There are a number of posts about PRX2, PRX4 and so forth. I have already found the information about verifying all DNS servers and creating a record in the host file. None of that changed anything.
I disabled Symantec thinking it was causing the problem. Nope.
Any suggestions are GREATLY appreciated!