Exchange 2016 Email not flowing internally or externally

Ok, so we had a major Internet issue with our ISP.  Afterwards our Exchange 2016 email server would not send or receive emails.  I have used the Microsoft test connectivity tool and found that it shows an error on inbound and have attempted the DNS NIC changes that were recommended elsewhere. as shown below for both send and receive capabilities.

Outbound:
Performing Outbound SMTP Test
       The outbound SMTP test was successful.
       
      Additional Details
       
Elapsed Time: 21871 ms.
       
      Test Steps
       
      Attempting reverse DNS lookup for IP address 173.167.171.86.
       The Microsoft Connectivity Analyzer successfully resolved IP address 173.167.171.86 via reverse DNS lookup.
       
      Additional Details
       
The Microsoft Connectivity Analyzer resolved IP address 173.167.171.86 to host 173-167-171-86-illinois.hfc.comcastbusiness.net.
Elapsed Time: 102 ms.
      Performing Real-Time Black Hole List (RBL) Test
       Your IP address wasn't found on any of the block lists selected.
       
      Additional Details
       
Elapsed Time: 21670 ms.
       
      Test Steps
       
      Checking Block List "SpamHaus Block List (SBL)"
       The address isn't on the block list.
       
      Additional Details
       
IP address 173.167.171.86 wasn't found on RBL.
Elapsed Time: 47 ms.
      Checking Block List "SpamHaus Exploits Block List (XBL)"
       The address isn't on the block list.
       
      Additional Details
       
IP address 173.167.171.86 wasn't found on RBL.
Elapsed Time: 137 ms.
      Checking Block List "SpamHaus Policy Block List (PBL)"
       The address isn't on the block list.
       
      Additional Details
       
IP address 173.167.171.86 wasn't found on RBL.
Elapsed Time: 40 ms.
      Checking Block List "SpamCop Block List"
       The address isn't on the block list.
       
      Additional Details
       
IP address 173.167.171.86 wasn't found on RBL.
Elapsed Time: 41 ms.
      Checking Block List "NJABL.ORG Block List"
       The address isn't on the block list.
       
      Additional Details
       
IP address 173.167.171.86 wasn't found on RBL.
Elapsed Time: 21231 ms.
      Checking Block List "SORBS Block List"
       The address isn't on the block list.
       
      Additional Details
       
IP address 173.167.171.86 wasn't found on RBL.
Elapsed Time: 58 ms.
      Checking Block List "MSRBL Combined Block List"
       The address isn't on the block list.
       
      Additional Details
       
IP address 173.167.171.86 wasn't found on RBL.
Elapsed Time: 19 ms.
      Checking Block List "UCEPROTECT Level 1 Block List"
       The address isn't on the block list.
       
      Additional Details
       
IP address 173.167.171.86 wasn't found on RBL.
Elapsed Time: 94 ms.
      Performing Sender ID validation.
       Sender ID validation was performed successfully.
       
      Additional Details
       
Elapsed Time: 99 ms.
       
      Test Steps
       
      Attempting to find the SPF record using a DNS TEXT record query.
       The Microsoft Connectivity Analyzer wasn't able to find the SPF record.
       
      Additional Details
       
No records were found.
Elapsed Time: 99 ms.



Inbound:

Testing inbound SMTP mail flow for domain 'kay@centertownshiptrustee.com'.
       The Microsoft Connectivity Analyzer failed to test inbound SMTP mail flow.
       
      Additional Details
       
Elapsed Time: 2151 ms.
       
      Test Steps
       
      Attempting to retrieve DNS MX records for domain 'centertownshiptrustee.com'.
       One or more MX records were successfully retrieved from DNS.
       
      Additional Details
       
MX Records Host mail.centertownshiptrustee.com, Preference 5
Elapsed Time: 105 ms.
      Testing Mail Exchanger mail.centertownshiptrustee.com.
       One or more SMTP tests failed for this Mail Exchanger.
       
      Additional Details
       
Elapsed Time: 2045 ms.
       
      Test Steps
       
      Attempting to resolve the host name mail.centertownshiptrustee.com in DNS.
       The host name resolved successfully.
       
      Additional Details
       
IP addresses returned: 173.167.171.86
Elapsed Time: 226 ms.
      Testing TCP port 25 on host mail.centertownshiptrustee.com to ensure it's listening and open.
       The port was opened successfully.
       
      Additional Details
       
Banner received: 220 Center-Server.centertwp.local Microsoft ESMTP MAIL Service ready at Tue, 3 Apr 2018 10:55:11 -0400
Elapsed Time: 461 ms.
      Analyzing SMTP Capabilities for server mail.centertownshiptrustee.com:25
       SMTP Capabilities were analyzed successfuly.
       
      Additional Details
       
SMTP Capabilities were analyzed successfuly.
250-Center-Server.centertwp.local Hello [40.85.91.8]
250-SIZE 37748736
250-PIPELINING
250-DSN
250-ENHANCEDSTATUSCODES
250-STARTTLS
250-8BITMIME
250-BINARYMIME
250 CHUNKING

Elapsed Time: 494 ms.
      Attempting to send a test email message to kay@centertownshiptrustee.com using MX mail.centertownshiptrustee.com.
       Delivery of the test email message failed.
       
      Additional Details
       
The server returned status code 451 - Error in processing. The server response was: 4.7.0 Temporary server error. Please try again later. PRX2
Exception details:
Message: Error in processing. The server response was: 4.7.0 Temporary server error. Please try again later. PRX2
Type: System.Net.Mail.SmtpException
Stack trace:
at System.Net.Mail.DataStopCommand.CheckResponse(SmtpStatusCode statusCode, String serverResponse)
at System.Net.Mail.DataStopCommand.Send(SmtpConnection conn)
at System.Net.Mail.SmtpClient.Send(MailMessage message)
at Microsoft.Exchange.Tools.ExRca.Tests.SmtpMessageTest.PerformTestReally()
Elapsed Time: 862 ms.


In turn, email is not flowing internally either.