Issue with SMTP in SAGE 100 paperless setup is 587 blocked?

I have tried adding an SMTP to the SAGE 100 email set up to enable the paperless office email. I  am unable to get the test email to work.  I believe the port is blocked ..I have validated the address, port, and cred's

This is the error message

Unable to verify SMTP connection.

ChilkatLog:

VerifySmtpConnection:

DllDate: Aug 25 2018

ChilkatVersion: 9.5.0.75

UnlockPrefix: SAGECM.CBX112019

Architecture: Little Endian; 32-bit

Language: .NET 4.6 / x86 / VS2017

VerboseLogging: 0

smtpConnectAndAuthenticate:

smtpConnect:

smtpHostname: smtp.cox.net

smtpPort: 587

connectionIsReady:

Need new SMTP connection

--connectionIsReady

smtpSocketConnect:

socketOptions:

SO_SNDBUF: 262144

SO_RCVBUF: 4194304

TCP_NODELAY: 1

SO_KEEPALIVE: 1

--socketOptions

--smtpSocketConnect

smtpGreeting:

readSmtpResponse:

SmtpCmdResp: 554 cxr-obgw-6002a.stratus.cloudmark.com cmsmtp 51.143.22.212 blocked. Refer to Error Codes section at www.cox.com/.../email-error-codes.html for more information. AUP#CXDNS

--readSmtpResponse

Failed SMTP greeting response code.

--smtpGreeting

Failed to get initial SMTP response..

Will re-try one time...

smtpSocketConnect:

socketOptions:

SO_SNDBUF: 262144

SO_RCVBUF: 4194304

TCP_NODELAY: 1

SO_KEEPALIVE: 1

--socketOptions

--smtpSocketConnect

smtpGreeting:

readSmtpResponse:

SmtpCmdResp: 554 cxr-obgw-6002a.stratus.cloudmark.com cmsmtp 51.143.22.212 blocked. Refer to Error Codes section at www.cox.com/.../email-error-codes.html for more information. AUP#CXDNS

--readSmtpResponse

Failed SMTP greeting response code.

--smtpGreeting

Failed to get initial SMTP response again.

--smtpConnect

--smtpConnectAndAuthenticate

Failed.

--VerifySmtpConnection

--ChilkatLog

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