Using Outbound Proxy Frontend connector

Question

Using Outbound Proxy Frontend connector

Hram Admin 140

Hello!

One more theory question:

https://learn.microsoft.com/en-us/exchange/mail-flow/mail-flow?view=exchserver-2019

What happens next depends on the configuration of the Send connector:
- Default: The Transport service uses the Send connector you created to send the message to the Internet.
- Outbound proxy: The Transport service uses the Send connector you created to send the message to the Front End Transport service on the local Mailbox server or on a remote Mailbox server. In the Front End Transport service, the default Receive connector named "Outbound Proxy Frontend <Mailbox server name>" accepts the message. The Front End Transport services sends the message to the Internet.

According to this-

In the Front End Transport service, the default Receive connector named "Outbound Proxy Frontend <Mailbox server name>" accepts the message. ...I must see the message sent from the Transport service (through its Send connector ) to the Front End Transport service (through its Outbound Proxy Frontend <Mailbox server name>connector) in the Front End Transport service's receive log (RECVnnnnn.LOG).

Q: Which log should contain the information on "The Front End Transport services sends the message to the Internet." ?

Regards,
Michael

Alex Zhang-MSFT 6,935 Reputation points Microsoft External Staff

2025-03-28T06:33:47.6166667+00:00

Hello, @Hram Admin

Is there any update on this thread? If the issue has been resolved, please mark the helpful replies as answers, this will make answer searching in the forum easier and be beneficial to other community members as well. Thanks for your understanding.

Best Wishes,

Alex Zhang

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Alex Zhang-MSFT 6,935 Reputation points Microsoft External Staff

2025-03-28T06:33:47.6166667+00:00

Hello, @Hram Admin

Is there any update on this thread? If the issue has been resolved, please mark the helpful replies as answers, this will make answer searching in the forum easier and be beneficial to other community members as well. Thanks for your understanding.

Best Wishes,

Alex Zhang

Answer 1

Andy David - MVP 155K MVP

Look under:

TransportRoles\Logs\FrontEnd\ProtocolLog\SmtpSend

Alex Zhang-MSFT 6,935 Reputation points Microsoft External Staff

2025-03-26T01:50:03.8066667+00:00
Hello, @Hram Admin

Welcome to the Microsoft Q&A platform!

In Exchange Server, protocol logging can be enabled for both receive and send connectors. When the FrontEnd Transport service sends the message to the Internet, the activity is recorded in the Send protocol log. This log provides details on the outbound connections and messages processed by the send connectors on the FrontEnd Transport service.

To enable and view the protocol logs, you can follow these steps:

1.Enable Protocol Logging: Open the Exchange Management Shell and use the Set-SendConnector cmdlet to enable protocol logging for the specific send connector.

Set-SendConnector -Identity "Your Send Connector Name" -ProtocolLoggingLevel Verbose

2.Locate the Protocol Log Files: The default location for the protocol log files can be found in the Exchange installation directory. Just as Andy David - MVP said, you can find it under C:\Program Files\Microsoft\Exchange Server\V15\TransportRoles\Logs\FrontEnd\ProtocolLog\SmtpSend

By checking these log files, you can find detailed information on messages sent by the FrontEnd Transport service to the Internet, including connection attempts, successes, and failures.

If the answer is helpful, please click on “Accept answer” as it could help other members of the Microsoft Q&A community who have similar questions and are looking for solutions.

Thank you for your support and understanding.

Best Wishes,

Alex Zhang

Answer 2

Hram Admin 140

Andy, thank you for the help!

Regards,
Michael

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Using Outbound Proxy Frontend connector

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