How the E-Mail Moderation works?

December 15th, 2018 | Posted by admin in Exchange - (0 Comments)

E-Mail Moderation enables you to control messages sent to a group, where a moderator will approve or reject the email to group. E-Mail moderation plays an important role to allow sending email to large distribution group to avoid un wanted emails delivering to large audience.

We need to understand what is arbitration mailbox before looking at how the email moderations works. Exchange installation creates 5 different arbitration mailbox used for sytem purporse, Microsoft Exchange Approval Assistant arbitration mailbox handles the Email moderation.

Below diagram shows how the message moderation works in Exchange On-Premise.

  1. Sender send an email to a Moderation Enabled Distribution Group.
  2. Categorizer identifies the email to be moderated and it will reroute the email to Arbitration Mailbox.
  3. Store drive stores the email in Arbitration Mailbox and send a request to Moderator to approve or reject the email
  4. Moderator will approve/reject the email, and the action will be send to arbitration mailbox
  5. Store Drive component on the Transport Role will mark the Moderators decision on the copy email available in Arbitration Mailbox
  6. Information assistant process the email based on the Moderator decision,

    6.a If the moderator approve the email, then the email will be delivered to the recipients (distribution group members)

    6.b If the moderator reject the email, then a rejected notification will be sent to the sender.

Note: If the moderator didn’t take an action to approve/reject the email, then the email will expire and the expiration notification will sent to the sender.

On the next blog, I will explain how the message moderation works in Hybrid Exchange Environment.

Let us assume that Exchange Hybrid Organization pointed its MX record to Office 365 or Exchange Online Protection, the mail flow works as shown in the below diagram.

In this article, we will see how the inbound and outbound flow works when the email routing configured to route through Exchange Online Protection.

Inbound Mail Flow

MX record point towards Office 365 Tenant -> Exchange Online Protection will receive the email and it will do the Recipient validation using Directory Based Edge Blocking, if the recipient is not available email will be dropped -> Anti-Virus scanning will occur, EOP has 3 AV engines -> Recipient resolution will occur like distribution group expansion -> Transport Rule will be applied, if any marked as SPAM using Transport rule then those emails will be quarantined -> Anti-Spam Protection will occur which includes, content scanning, outlook safe sender validation, URL blocking, bulk mail filtering, international spam filtering – > customer delivery pool and then to On-Premise Server.

Outbound Mail Flow

Office 365 or On-Premise user send an email -> Virus Scanning will occur -> Recipient Resolve -> Transport Rules -> SPAM Protection -> Outbound Delivery Pool -> Recipient MX resolution -> Recipient domain.

If an outbound email identified with high SPAM score, then it will delivered via high-risk delivery pool.

Above are the high level illustration of how the mail flow works in Office 365.

Office 365 Interview Questions and Answers

December 11th, 2018 | Posted by admin in Exchange - (1 Comments)

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