Exchange Q&A: Mail Flow (2)

1.What are the connectors used for?

Exchange uses connectors to enable incoming and outgoing mail flow on Exchange servers, and also between services in the transport pipeline on the local Exchange server.

2.What are the types of connectors that are available in Exchange?

  • Receive connectors;
  • Send connectors;
  • Delivery agents and Delivery Agent Connectors;
  • Foreign connectors.

3. What inbound SMTP connections Exchange servers use Receive connectors to control?

  • Messaging servers that are external to the Exchange organization;
  • Services in the transport pipeline on the local Exchange server or on remote Exchange servers;
  • Email clients that need to use authenticated SMTP to send messages.

4.Where can we create Receive connectors?

  • The Transport service on Mailbox servers;
  • The Front End Transport service on Mailbox servers;
  • The Edge Transport servers.

5.What are the are the important settings on Receive connectors?

  • Local adapter bindings: Configure the combination of local IP addresses and TCP ports that the Receive connector uses to accept connections;
  • Remote network settings: Configure the source IP addresses that the Receive connector listens to for connections;
  • Usage type: Configure the default permission groups and smart host authentication mechanisms for the Receive connector;
  • Permission groups: Configure who’s allowed to use the Receive connector, and the permissions that they receive.

6.What is the primary function of Receive connectors in the Front End Transport service?

To accept anonymous and authenticated SMTP connections into our Exchange organization.

7.What are the default Receive connectors that are created in the Front End Transport service on Mailbox servers?

  • Client Frontend: Accepts connections from authenticated SMTP clients;
  • Default Frontend: Accepts anonymous connections from external SMTP servers;
  • Outbound Proxy Frontend: Accepts authenticated connections from the Transport service on Mailbox servers.

8.What is the primary function of Receive connectors in the Transport service?

To accept authenticated and encrypted SMTP connections from other transport services on the local Mailbox server or remote Mailbox servers in our organization.

9.What are the default Receive connectors that are created in the Transport service on Mailbox servers?

Client Proxy:

Accepts authenticated client connections that are proxied from the Front End Transport service.

Default:

Accepts authenticated connections from:

  • The Front End Transport service on the local or remote Mailbox servers;
  • The Transport service on remote Mailbox servers;
  • The Mailbox Transport service on the local or remote Mailbox servers;
  • Edge Transport servers the connections are encrypted with the Exchange server’s self-signed certificate.

10.What are the available usage types of receive connector?

  • Client;
  • Custom;
  • Internal;
  • Internet;
  • Partner.

11.What are the available authentication mechanisms of receive connector?

  • Transport Layer Security (TLS);
  • Basic authentication;
  • Offer basic authentication only after starting TLS;
  • Integrated Windows authentication;
  • Exchange Server authentication;
  • Externally secured.

12.What is Permission Group?

A permission group is a predefined set of permissions that’s granted to well-known security principals and assigned to a Receive connector. Permission groups define who can use the Receive connector, and the permissions that they get.

13.What are the available permission groups of receive connector?

  • Anonymous users;
  • Exchange users;
  • Exchange servers;
  • Legacy Exchange servers;
  • Partners.

14.How to see the permissions that are assigned to security principals on a Receive connector

Use the following syntax in the Exchange Management Shell:

Get-ADPermission -Identity <ReceiveConnector> [-User <SecurityPrincipal>] | where {($_.Deny -eq $false) -and ($_.IsInherited -eq $false)} | Format-Table User,ExtendedRights

15.How to add permissions to a security principal on a Receive connector?

Use the following syntax:

Add-ADPermission -Identity <ReceiveConnector> -User <SecurityPrincipal> -ExtendedRights “<Permission1>”,”<Permission2>”…

16.How to remove permissions from a security principal on a Receive connector?

Use the following syntax:

Remove-ADPermission -Identity <ReceiveConnector> -User <SecurityPrincipal> -ExtendedRights “<Permission1>”,”<Permission2>”…

Still have questions? Click here to view Microsoft’s official documentation on Exchange.

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