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Office365 DKIM and DMARC configuration

DKIM and DMARC are used to prevent spoofing of the domain name by spammers. Configuring it in Office365 is quite easy, but must be done manually if you use a custom domain (so not the standard .onmicrosoft.com). I assume, that the standard DNS configuration including the SPF record is already done, as they are set automatically or at least validated during the setup of a new domain.
To configure the DKIM and DMARC records, you just need to add a few DNS record and enable it in Exchange Online:

Step 1: Enable DKIM

Go to Exchange Admin Center and open dkim which you can find under protection. Select your domain and press “enable”:

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Office 365 – Forward all mails sent to a (sub)domain

There are many reasons why someone wants to forward all incoming mails from a domain to a specific address. One use case is by sure testing. If you test an application, then you probably need a lot of mail addresses. To avoid creating all the mail addresses, you could use tools like postfix for it. But it also requires some setup and configuration.
I am Office 365 user and I love it and by sure, I want to solve this issue with Office 365. I tried it and it took some time, but then I found the right setup.

So, what I want to achieve is simple:
All mails sent to @tst.axr.at should be forwarded to a shared mailbox, where all testers have access (or to specific address).

Sounds simple and you can easily configure it in Office 365, but there are a few pitfalls, that’s why I created this blog post. So let’s go through it step by step.

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