Simple definition
A configuration that controls transport between Microsoft 365 and another system SMTP.
Technical definition
Connectors define direction, domains, IP, TLS and routing rules for certain messaging streams.
What is it used for ?
Link Microsoft 365 to a server SMTP, a gateway or application.
Practical example
An internal application can send via a public IP-authorized connector.
Common issues
- IP wrong source
- TLS required not available
- Connector too permissive
Related terms
Key takeaway: Exact behavior and commands may vary depending on versions, products and architectures.