On premise domain controller running Windows 2012r2
Exchange will not receive external emails
No firewall on and AV removed
Error from Microsoft Remote Connectivity Analyer:
Test Details
Performing Outbound SMTP Test
The outbound SMTP test failed.
Test Steps
Attempting reverse DNS lookup for IP address 51.219.168.83.
The Microsoft Connectivity Analyzer successfully resolved IP address 51.219.168.83 via reverse DNS lookup.
Additional Details
Performing Real-Time Black Hole List (RBL) Test
Your IP address wasn't found on any of the block lists selected.
Test Steps
Performing Sender ID validation.
Sender ID validation failed.
Test Steps
Attempting to find the SPF record using a DNS TEXT record query.
The SPF record was found.
Additional Details
SPF record found: "v=spf1 ip4:100.42.120.96/27 ip4:100.42.115.0/27 ip4:208.70.208.0/22 ~all"
Parsing the SPF record and evaluating mechanisms and modifiers.
SPF record evaluation resulted in a Sender ID failure.
Test Steps
Evaluating IP address mechanism: "+ip4:100.42.120.96/27"
Additional Details
Evaluating IP address mechanism: "+ip4:100.42.115.0/27"
Additional Details
Evaluating IP address mechanism: "+ip4:208.70.208.0/22"
Additional Details
Evaluating All mechanism: "~all"
All mechanisms indicated a negative status.
Additional Details
Status: SoftFail
Exchange will not receive external emails
No firewall on and AV removed
Error from Microsoft Remote Connectivity Analyer:
Test Details
Performing Outbound SMTP Test
The outbound SMTP test failed.
Test Steps
Attempting reverse DNS lookup for IP address 51.219.168.83.
The Microsoft Connectivity Analyzer successfully resolved IP address 51.219.168.83 via reverse DNS lookup.
Additional Details
Performing Real-Time Black Hole List (RBL) Test
Your IP address wasn't found on any of the block lists selected.
Test Steps
Performing Sender ID validation.
Sender ID validation failed.
Test Steps
Attempting to find the SPF record using a DNS TEXT record query.
The SPF record was found.
Additional Details
SPF record found: "v=spf1 ip4:100.42.120.96/27 ip4:100.42.115.0/27 ip4:208.70.208.0/22 ~all"
Parsing the SPF record and evaluating mechanisms and modifiers.
SPF record evaluation resulted in a Sender ID failure.
Test Steps
Evaluating IP address mechanism: "+ip4:100.42.120.96/27"
Additional Details
Evaluating IP address mechanism: "+ip4:100.42.115.0/27"
Additional Details
Evaluating IP address mechanism: "+ip4:208.70.208.0/22"
Additional Details
Evaluating All mechanism: "~all"
All mechanisms indicated a negative status.
Additional Details
Status: SoftFail