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Loop Prevention in Exchange Online: Demystified

Understanding Loop Prevention in Exchange Online
The Exchange Online platform is a powerful and highly secure platform for businesses to manage their emails, contacts, and calendars. As part of its robust security, Exchange Online includes several features to protect against malicious emails, including loop prevention. In this article, we will discuss what loop prevention is and how it works in Exchange Online.

What is Loop Prevention?
Loop prevention is a feature of Exchange Online that prevents emails from being sent to a recipient multiple times. This can happen if a message is sent to a recipient and then forwarded to the same recipient. The loop prevention feature will detect the loop and prevent the message from being delivered to the recipient a second time.

How Does Loop Prevention Work in Exchange Online?
Loop prevention in Exchange Online works by using a special header called the “Loop Prevention Header” (LPH). When an email is sent to a recipient, the Exchange Online server will add the LPH to the message before it is delivered. The LPH contains information about the sender, the recipient, and the message ID.

When the recipient forwards the message to the same recipient, the Exchange Online server will look at the LPH and determine if it has already seen the message. If it has, it will reject the message and not deliver it to the recipient a second time. If it has not seen the message before, it will deliver it normally.

How Does Loop Prevention Help Exchange Online?
Loop prevention helps to make Exchange Online more secure by preventing malicious emails from being sent to the same recipient multiple times. It also helps to protect the recipients from being spammed with the same message multiple times.

Conclusion
Loop prevention is an important part of Exchange Online’s robust security. It helps to protect the platform from malicious emails and also prevents recipients from being spammed with the same message multiple times.

If you are using Exchange Online, it is important to understand how loop prevention works and what it can do to help keep your platform secure.

By understanding how loop prevention works, you can ensure that your Exchange Online platform is as secure as possible and that your users are protected from malicious emails.
References:
Loop Prevention in Exchange Online Demystified

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