-->![Edge Edge](/uploads/1/3/7/2/137264070/631298360.jpg)
The Edge Transport server role is an optional role that's typically deployed on a computer located in an Exchange organization's perimeter network and is designed to minimize the attack surface of the organization. The Edge Transport server role handles all internet-facing mail flow, which provides SMTP relay and smart host services for the internal on-premises Exchange servers in your organization.
Edge Transport servers in Exchange-based hybrid deployment organizations
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Exchange 2016 organizations that want to use Edge Transport servers have the option of deploying Edge Transport servers running the latest release of Exchange 2010 or later. Use Edge Transport servers if you don't want to expose internal Exchange servers directly to the internet. When you deploy an Edge Transport server in a hybrid deployment, Exchange Online, via the Exchange Online Protection service, will connect to your Edge Transport server to deliver messages. The Edge Transport server will then deliver messages to the on-premises Exchange Mailbox server where the recipient mailbox is located.
Important
Don't place any servers, services, or devices that process or modify SMTP traffic between your on-premises Exchange servers and Microsoft 365 or Office 365. Secure mail flow between your on-premises Exchange organization and Microsoft 365 or Office 365 depends on information contained in messages sent between the organization. Firewalls that allow SMTP traffic on TCP port 25 through without modification are supported. If a server, service, or device processes a message sent between your on-premises Exchange organization and Microsoft 365 or Office 365, this information is removed. If this happens, the message will no longer be considered internal to your organization and will be subject to anti-spam filtering, transport and journal rules, and other policies that may not apply to it.
An Edge subscription is required for Exchange hybrid. If you have other Exchange Edge Transport servers in other locations that won't handle hybrid transport, they don't need to be upgraded to support a hybrid deployment. However, if in the future you want EOP to connect to additional Edge Transport servers for hybrid transport, they must be running the latest release of Exchange 2010 or later.
An Edge subscription is required for Exchange hybrid. If you have other Exchange Edge Transport servers in other locations that won't handle hybrid transport, they don't need to be upgraded to support a hybrid deployment. However, if in the future you want EOP to connect to additional Edge Transport servers for hybrid transport, they must be running the latest release of Exchange 2010 or later.
Adding an Edge Transport server to a hybrid deployment
Deploying an Edge Transport server in your on-premises organization when you configure a hybrid deployment is optional. When configuring your hybrid deployment, the Hybrid Configuration wizard allows you to either select one or more internal on-premises Exchange servers, or to select one or more on-premises Edge Transport servers to handle hybrid mail transport with the Exchange Online organization.
When you add an Edge Transport server to your hybrid deployment, it communicates with EOP on behalf of the internal Exchange servers. The Edge Transport server acts as a relay between the internal Exchange servers and EOP for outbound messaging from the on-premises organization to the Exchange Online organization. The Edge Transport server also acts as a relay between the internal Exchange servers for inbound messaging from the Exchange Online organization to the on-premises organization. All connection security previously handled by internal Exchange servers is handled by the Edge Transport server. Recipient lookup, compliance policies, and other message inspection, continue to be done on the internal Exchange servers.
If you add an Edge Transport server to your hybrid deployment, you don't need to route mail sent between on-premises users and internet recipients through it. Only messages sent between the on-premises and Exchange Online organizations will be routed through the Edge Transport server.
Important
![Edge Edge](/uploads/1/3/7/2/137264070/631298360.jpg)
Outlook 365
If you need to delete and recreate an Edge subscription that's used to communicate between your on-premises organization and Exchange Online, make sure to run the Hybrid Configuration wizard again. Recreating an Edge subscription removes configuration changes that are needed for your on-premises organization to talk to Exchange Online. Re-running the Hybrid Configuration wizard applies those changes again.
Mail flow without an Edge Transport server
The following process and diagram describes the path messages take between an on-premises organization and Exchange Online when there isn't an Edge Transport server deployed:
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- Outbound messages from the on-premises organization to recipients in the Exchange Online organization are sent from a mailbox on an internal Exchange server.
- The Exchange server sends the message directly to EOP .
- EOP delivers the message to the Exchange Online organization.
Messages sent from the Exchange Online organization to recipients in the on-premises organization follow the reverse route.
Mail flow in a hybrid deployment without an Edge Transport server deployed
Mail flow with an Edge Transport server
The following process describes the path messages take between an on-premises organization and Exchange Online when there is an Edge Transport server deployed. Messages from the on-premises organization to recipients in the Exchange Online organization are sent from the internal Exchange server:
- Messages from the on-premises organization to recipients in the Exchange Online organization are sent from a mailbox on an internal Exchange server.
- The Exchange server sends the message to an Edge Transport server running a supported version and release of Exchange.
- The Edge Transport server sends the message to EOP.
- EOP delivers the message to the Exchange Online organization.
Messages sent from the Exchange Online organization to recipients in the on-premises organization follow the reverse route.
Note
Installing an Edge server and establishing an Edge subscription will impact your mail flow. This process automatically creates two Send connectors for internet mail flow: one to send e-mail to all internet domains, and another to send email from the Edge Transport server to the internal Exchange organization. Please review the connectors and mail flow if this is not your intended mail flow scenario.
Mail flow in a hybrid deployment with an Edge Transport server deployed
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Microsoft 365 is designed to enable customers all over the world to connect to the service using an internet connection. As the service evolves, the security, performance, and reliability of Microsoft 365 are improved based on customers using the internet to establish a connection to the service.
Customers planning to use Microsoft 365 should assess their existing and forecasted internet connectivity needs as a part of the deployment project. For enterprise class deployments reliable and appropriately sized internet connectivity is a critical part of consuming Microsoft 365 features and scenarios.
Network evaluations can be performed by many different people and organizations depending on your size and preferences. The network scope of the assessment can also vary depending on where you're at in your deployment process. To help you get a better understanding of what it takes to perform a network assessment, we've produced a network assessment guide to help you understand the options available to you. This assessment will determine what steps and resources need to be added to the deployment project to enable you to successfully adopt Microsoft 365.
A comprehensive network assessment will provide possible solutions to networking design challenges along with implementation details. Some network assessments will show that optimal network connectivity to Microsoft 365 can be accommodated with minor configuration or design changes to the existing network and internet egress infrastructure.
Some assessments will indicate network connectivity to Microsoft 365 will require additional investments in networking components. For example, enterprise networks that span branch offices and multiple geographic regions may require investments in SD-WAN solutions or optimized routing infrastructure to support internet connectivity to Microsoft 365. Occasionally an assessment will indicate network connectivity to Microsoft 365 is influenced by regulation or performance requirements for scenarios such as Skype for Business Online media quality. These additional requirements may lead to investments in internet connectivity infrastructure, routing optimization, and specialized direct connectivity.
Some resources to help you assess your network:
- See Microsoft 365 network connectivity overview for conceptual information about Microsoft 365 networking.
- See Microsoft 365 Network Connectivity Principles to understand the connectivity principles for securely managing Microsoft 365 traffic and getting the best possible performance.
- Sign up for Microsoft FastTrack for guided assistance with Microsoft 365 planning, design and deployment.
- See the Microsoft 365 connectivity test section below to run basic connectivity tests that provide specific guidance about networking connectivity improvements that can be made between a given user location and Microsoft 365.
Note
Microsoft authorization is required to use ExpressRoute for Office 365. Microsoft reviews every customer request and only authorizes ExpressRoute for Office 365 usage when a customer's regulatory requirement mandates direct connectivity. If you have such requirements, please provide the text excerpt and web link to the regulation which you interpret to mean that direct connectivity is required in the ExpressRoute for Office 365 Request Form to begin a Microsoft review. Unauthorized subscriptions trying to create route filters for Office 365 will receive an error message.
Key points to consider when planning your network assessment for Microsoft 365:
- Microsoft 365 is a secure, reliable, high performance service that runs over the public internet. We continue to invest to enhance these aspects of the service. All Microsoft 365 services are available via internet connectivity.
- We are continually optimizing core aspects of Microsoft 365 such as availability, global reach, and performance for internet based connectivity. For example, many Microsoft 365 services leverage an expanding set of internet facing edge nodes. This edge network offers the best proximity and performance to connections coming over the internet.
- When considering using Microsoft 365 for any of the included services such as Teams or Skype for Business Online voice, video, or meeting capabilities, customers should complete an end to end network assessment and meet connectivity requirements using Microsoft FastTrack.
If you're evaluating Microsoft 365 and aren't sure where to begin with your network assessment or have found network design challenges that you need assistance to overcome, please work with your Microsoft account team.
The Microsoft 365 connectivity test
The Microsoft 365 connectivity test is a proof of concept (POC) network assessment tool that runs basic connectivity tests against your Microsoft 365 tenant and makes specific network design recommendations for optimal Microsoft 365 performance. The tool highlights common large enterprise network perimeter design choices which are useful for Internet web browsing but impact the performance of large SaaS applications such as Microsoft 365.
The Network Onboarding tool does the following:
- Detects your location, or you can specify a location to test
- Checks the location of your network egress
- Tests the network path to the nearest Microsoft 365 service front door
- Provides advanced tests using a downloadable Windows 10 application that makes perimeter network design recommendations related to proxy servers, firewalls, and DNS. The tool also runs performance tests for Skype for Business Online, Microsoft Teams, SharePoint Online and Exchange Online.
The tool has two components: a browser-based UI that collects basic connectivity information, and a downloadable Windows 10 application that runs advanced tests and returns additional assessment data.
The browser-based tool displays the following information:
Office 365 Home Download
- Results and impact tab
- The location on a map of the in-use service front door
- The location on a map of other service front doors that would provide optimal connectivity
- Relative performance compared to other Microsoft 365 customers near you
- Details and solutions tab
- User location by city and country
- Network egress location by city, state and country
- User to network egress distance
- Microsoft 365 Exchange Online service front door location
- Optimal Microsoft 365 Exchange Online service front door(s) for user location
- Customers in your metro area with better performance
The Advanced Tests downloadable application provides the following additional information:
- Details and solutions tab (appended)
- User's default gateway
- Client DNS Server
- Client DNS Recursive Resolver
- Exchange Online DNS server
- SharePoint Online DNS server
- Proxy server identification
- Media connectivity check
- Media quality packet loss
- Media quality latency
- Media quality jitter
- Media quality packet reorder
- Connectivity tests to multiple feature-specific endpoints
- Network path diagnostics that include tracert and latency data for the Exchange Online, SharePoint Online and Teams services
You can read about the Microsoft 365 connectivity test and provide feedback at the Updated Microsoft 365 connectivity test POC with new network design recommendations blog post. Information about future updates to this tool and other Microsoft 365 networking updates will be posted to the Office 365 Networking blog.
Here's a short link you can use to come back: https://aka.ms/o365networkconnectivity.