More Clarification needed on Throttling and Blocking Email from Persistently Vulnerable Exchange Servers to Exchange Online

JanakKhadka 526 Reputation points
2023-12-04T10:03:48.9933333+00:00

Hi Team,

 

I hope this message finds you well. I am reaching out to seek clarification on the potential impacts related to throttling and blocking in the context of an upcoming upgrade in our Exchange Server environment.

Our Current Environment comprises the following components:

  1. Exchange 2010 Edge Server
  2. Exchange 2013 CAS Server
  3. Exchange 2013 MBX Server

The proposed upgrade involves only the Exchange 2010 Edge Server, which will be upgraded to Exchange 2019. The Exchange 2013 CAS and MBX servers will remain unchanged in this process.

I am particularly interested in understanding the potential implications on throttling and blocking when relaying emails internally from the 2013 MBX server to the upgraded Edge Server and subsequently to Microsoft 365. Considering that the direct connection to Microsoft 365 will be facilitated by the upgraded Edge Server:

Will this upgrade effectively address throttling and blocking concerns for direct connections to Microsoft 365 through the Edge Server?

Should we anticipate any throttling or blocking impacts for internally relayed emails, specifically starting from the 2013 schedule, and passing through the 2013 MBX server to the upgraded Edge Server before reaching Microsoft 365?

I would greatly appreciate your insights on this matter and any recommendations you may have for ensuring a smooth transition with minimal disruptions.

Thank you for your time and assistance.

 

Best regards,

Janak Khadka

Microsoft Exchange Online
Exchange Server
Exchange Server
A family of Microsoft client/server messaging and collaboration software.
1,189 questions
Microsoft Exchange Hybrid Management
Microsoft Exchange Hybrid Management
Microsoft Exchange: Microsoft messaging and collaboration software.Hybrid Management: Organizing, handling, directing or controlling hybrid deployments.
1,997 questions
0 comments No comments
{count} vote

3 answers

Sort by: Most helpful
  1. Jarvis Sun-MSFT 10,186 Reputation points Microsoft Vendor
    2023-12-05T02:59:52.9333333+00:00

    Hi @JanakKhadka

    Welcome to our Q&A forum!

    To address your problem, Microsoft is enabling a transport-based enforcement system in Exchange Online that has three primary functions: reporting, throttling, and blocking. The system is designed to alert an admin about unsupported or unpatched Exchange servers in their on-premises environment that need remediation (upgrading or patching). The system also has throttling and blocking capabilities, so if a server is not remediated, mail flow from that server will be throttled (delayed) and eventually blocked.

    Considering that the direct connection to Microsoft 365 will be facilitated by the upgraded Edge Server, it is likely that the upgrade will address throttling and blocking concerns for direct connections to Microsoft 365 through the Edge Server. However, it is possible that internally relayed emails, specifically starting from the 2013 schedule, and passing through the 2013 MBX server to the upgraded Edge Server before reaching Microsoft 365, may experience some throttling or blocking impacts.

    To ensure a smooth transition with minimal disruptions, I would recommend that you upgrade or patch your Exchange servers as soon as possible to avoid any potential issues.

    Reference: https://techcommunity.microsoft.com/t5/exchange-team-blog/throttling-and-blocking-email-from-persistently-vulnerable/ba-p/3815328


    If the answer is helpful, please click "Accept Answer" and kindly upvote it. If you have extra questions about this answer, please click "Comment". 

    Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.


  2. Deleted

    This answer has been deleted due to a violation of our Code of Conduct. The answer was manually reported or identified through automated detection before action was taken. Please refer to our Code of Conduct for more information.


    Comments have been turned off. Learn more

  3. Deleted

    This answer has been deleted due to a violation of our Code of Conduct. The answer was manually reported or identified through automated detection before action was taken. Please refer to our Code of Conduct for more information.


    Comments have been turned off. Learn more