the Exchange admin center.
POP3 clients 110/TCP (POP3 995/TCP (secure POP3) POP3 is disabled by default.
The POP3 service in the Client Access services on the Mailbox server proxies connections to the POP3 Backend service on a Mailbox server.DNS for name resolution of the next mail hop (not pictured) 53/UDP,53/TCP (DNS) Edge Transport server DNS server See the Name resolution section.For more information, see Sender reputation and the Protocol Analysis agent.Outbound mail - Edge Transport server to Internet 25/TCP (smtp) Edge Transport server Internet (any) The default Send connector named "EdgeSync - Active Directory site name to Internet" relays outbound mail on port 25 from the Edge Transport server to the Internet.Open proxy server detection in sender reputation (not pictured) see comments Edge Transport server Internet By default, sender reputation (the Protocol Analysis agent) uses open proxy server detection as one of the criteria to calculate the sender reputation level (SRL) of the source messaging server.DNS for name resolution of the next mail hop (not pictured) 53/UDP,53/TCP (DNS) Mailbox server DNS server See the Name resolution section.Smtp clients (authenticated) 587/TCP (authenticated smtp) The default Received connector named "Client Frontend Server name " in the Front End Transport service listens for authenticated smtp client submissions on port 587.Shipping and handling.75 per shipment.Edge Transport servers are almost always located in a perimeter network, so it's expected that you'll restrict network traffic between the Edge Transport server and the Internet, and between the Edge Transport server and your internal Exchange organization.Box 30183, Portland, OR, email: Robert Jones, Director.For more information, see Create a Send connector to send mail to the Internet.
Network ports required for mail flow How mail is delivered to and from your Exchange organization depends on your Exchange topology.
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Mail is relayed from the Transport service on any Mailbox server in the subscribed Active Directory site to an Edge Transport server using the implicit and invisible intra-organization Send connector that automatically routes mail between Exchange servers in the same organization.Network ports required for clients and services.Inbound mail flows from the Edge Transport server to a Mailbox server in the subscribed Active Directory site.Read about this change in our blog post.Make the process much more accessible, safe and convenient.Outlook Anywhere, mAPI over http in Exchange 2016.The default Receive connector named "Default internal Receive connector Edge Transport server name " on the Edge Transport server listens for smtp mail on port 25 from the Transport service on any Mailbox server in the subscribed Active Directory site.Offline address books in Exchange 2016.Resources, contact Us, copyright 1995, l'échange des princesse critique 1996, 1997, 1998, 1999, 2000.For more information, see Configure Send connectors to proxy outbound mail.Autodiscover (fallback when 443/TCP isn't available) 80/TCP (http whenever possible, we recommend using encrypted web connections on 443/TCP to help protect data and credentials.You have to create Send connectors manually.