![]() You have to create Send connectors manually. For more information, see Implicit Send connectors.īy default, Exchange doesn't create any Send connectors that allow you to send mail to the internet. Mail is relayed from the Front End Transport service to the Transport service on a Mailbox server using the implicit and invisible intra-organization Send connector that automatically routes mail between Exchange servers in the same organization. The default Receive connector named 'Default Frontend ' in the Front End Transport service listens for anonymous inbound SMTP mail on port 25. The network ports that are required for mail flow in an Exchange organization that has only Mailbox servers are described in the following diagram and table. Note: If you have email clients that are only able to submit authenticated SMTP email on port 25, you can modify the network adapter bindings of the client Receive connector to also listen for authenticated SMTP email submissions on port 25. The default Received connector named 'Client Frontend ' in the Front End Transport service listens for authenticated SMTP client submissions on port 587. The POP3 service in the Client Access services on the Mailbox server proxies connections to the POP3 Backend service on a Mailbox server. For more information, see POP3 and IMAP4 in Exchange Server. The IMAP4 service in the Client Access services on the Mailbox server proxies connections to the IMAP4 Backend service on a Mailbox server. However, you may find that some services must be configured to use unencrypted web connections on 80/TCP to the Client Access services on Mailbox servers. Whenever possible, we recommend using encrypted web connections on 443/TCP to help protect data and credentials. Autodiscover (fallback when 443/TCP isn't available).Outlook on the web (redirect to 443/TCP).Unencrypted web connections are used by the following clients and services: Offline address books in Exchange Server.Autodiscover service in Exchange Server.Outlook on the web (formerly known as Outlook Web App)įor more information about these clients and services, see the following topics:.Offline address book (OAB) distribution.Best Software For Downloading Music On MacĮdge Transport servers have no involvement in the network traffic that's associated with these clients and services.Įncrypted web connections are used by the following clients and services: ![]()
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