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The content of this article mainly focuses on how Exchange Online hides the email address of external senders. The content of the article is clear and well-organized. It is very suitable for beginners to learn and is worth reading. Interested friends can follow the editor to read together. I hope you can get something through this article!

An enterprise wants to have a mailbox specially for internal complaints, employees can use corporate mailboxes to send e-mail complaints or personal mailboxes (QQ, 263, etc.) to complain, but they hope that these complaint emails can hide the email address of the sender.

This question caused a lot of discussion in the group, such as why to complain anonymously, whether the complaint email IT administrator could find out who sent it, and so on. I do think that since this is a need of the customer, let's try to find a way to meet it (of course, it is also essential to guide the customer correctly)

Overall, there are two solutions:

Plan 1: set up two mailboxes, one mailbox is used to finally receive complaint emails, and the other mailbox is used to inform users that they are used to send complaint emails, and the mail is redirected through mail flow rules

Plan 2: set up a mailbox to receive complaints, and change all incoming headers to hide the sender's address.

Relatively speaking, the first solution is a little eclectic, and the Exchange administrator can easily know who sent each email, so the second plan is even more abnormal. Even if the administrator changes the email header directly, the administrator can't find out who sent the email. Personally, I thought the second scheme was more reliable, and then I did a test, and the effect was good and the effect was shared to the 5DMailgroup. Here to share with you how to do it, I hope to give some help to some enterprises with similar needs.

First log in to the Exchange Online Administration Center. World Internet Edition address: partner.outlook.cn/ecp International Edition address: outlook.office365.com/ecp

Select mail flow to create custom rules

Then fill in the name of the rule and choose to apply the rule on the premise that the recipient is the email address of the complaint and the sender is an external user of the organization. Only if these two conditions are met at the same time can you delete the From field in the header. Then select apply now and click OK, as shown below

At the same time, you need to establish another rule to delete the reply address field in the header, otherwise using this mailbox to reply to the email will still show the recipient.

The prerequisite is the same as the above rule, except that to delete the field in the header is Return-Path, then select apply now and click to confirm to take effect.

After completing the above two rules, we send a test email to this account through an external mailbox.

Then log in to the mailbox where this rule is applied to check the received mail and find that the external mail has no sender information, as shown in the following figure.

Click to reply to this email, and the sender information is also empty.

Let's take a closer look at the information in the email header:

So the sender and reply address were deleted from the whole header.

Some students will wonder if I can find out who sent the email from the email tracking or delivery report in the Exchange management center. Let's take a look at the result. The sender information is directly empty.

However, if you look at the details, you will find that the message is recognized as spam by Office365's EOP:

I am not surprised about this. Since then, I have thought of various ways: make a spam filtering policy for this recipient, add a trusted whitelist, and modify the default EOP spam address policy to allow all e-mails sent from .com top-level domains not to check spam, still invalid or recognized as spam.

It even sets terminal rules for receiving mailboxes. As long as it is spam\ or all messages are automatically moved to the inbox, checking the matching from qq.com from hotmail.com in the message header will not be recognized as spam, which still has no effect.

This shows how abnormal Office365's EOP strategy is, and we should also like EOP at the same time!

However, there is a custom rule in the mail flow rules in Office365 that can solve the problem of this kind of "custom spam", that is, do not use spam filtering.

Select that the recipient is the user who receives the complaint mailbox, and the sender is outside the organization to implement the no-spam filtering policy. If you want more stringent control, add header content keywords such as from qq.com from hotmail.com to the conditions.

When I finished, I used hotmail's mailbox to send an email test to this account. The email went directly to the inbox, and there was no sender's address information.

Since then, the whole process has been shared.

Thank you for your reading. I believe you have some understanding of "how Exchange Online hides the email address of external senders". Go ahead and practice it. If you want to know more about it, you can follow the website! The editor will continue to bring you better articles!

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