Nov 26, 2018 Say I have some-domain.com with Office 365 and I setup the 2 CNAME records and enable DKIM. Do I then have to get and store the same key on my third-party sender's server so that they can sign the messages using the same key? Or do I get them to generate a key and add it to Office 365 to use? Or do both sign differently? Sep 19, 2019 How to get the DKIM public key from Plesk if an external DNS is used and local DNS is not installed? Note: This article may require additional administrative knowledge to apply. If any help required, contact server’s administrator or hosting support. The only way to get the public key is to extract it manually with openssl from a.

UPDATED 25th Sept 2019
Updated due to changes in the Office 365 admin section

Microsoft implemented DKIM signing for outbound emails early in 2015 but the implementation was still a little clunky, requiring knowledge of the DKIM DNS formatting and the liberal application PowerShell commands.

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Fortunately, they have improved this and placed it within the grasp of the average user and/or administrator. I’ve outlined the steps below to make this as easy as possible.

1. Enable DKIM on Office 365

Click the menu button in the top left corner (it looks like a telephone dial pad)

Click Admin

Click … Show All to see all the options on the left Windows 8.1 enterprise build 9600 product key.

On the left you’ll have a menu, at the very bottom will be an option called Admin Centers

Using the following commands: 1- Generating a Private Key: openssl genrsa -aes256 -out privatekey.pem 2048. 2- Generating a Public Key: openssl rsa -pubout -in privatekey.pem -out publickey.pem. You can use the specified library (System.IdentityModel.Tokens.Jwt) to generate. Public key example.

Expand this menu and click Exchange, this will open a new window displaying the ‘Exchange Admin Center‘ (if you don’t see it, make sure your browsers popup blocker hasn’t stopped the page from appearing).

On the left-hand menu click Protection

From the new sub menu at the top of the right hand section, click DKIM

Select your domain name from the list and then click Enable‘ on the right-hand side:

2. Determine Your Office 365 Tenancy Domain (AKA your onMicrosoft Domain)

To determine the DNS record you will need to setup for your domain name, you first need to login to your Office 365 account via http://portal.microsoftonline.com. and find out what the temporary domain name Microsoft gave you when you setup your account:

Click the menu button in the top left corner (it looks like a telephone dial pad)

Click Admin

Click … Show All to see all the options on the left

https://cleverimg.amebaownd.com/posts/18206746. Upon detecting the internet it will show a dialog option.

Click Setup to expand this option

Click Domains

You should see a domain that ends in onmicrosoft.com similar to this:

Note down the domain, in my example above mine is bobmckay.onmicrosoft.com.

Dkim Key Office 365

3. Create CNAME DKIM DNS Records

Login to the panel used to manage your domain names DNS records – this will often be either your domain name registrar such as 123-Reg and GoDaddy or it could be your website hosting account (a cPanel, Plesk or CloudFlare account).

You can retrieve information about your domain names DNS using IntoDNS.co.uk and whois.com.

You need to create two CNAME records (not TXT records), based on the following format:

Host	Value
selector1._domainkey	selector1-bobmckay-com._domainkey.bobmckay.onmicrosoft.com
selector2._domainkey	selector2-bobmckay-com._domainkey.bobmckay.onmicrosoft.com

The VALUE part of the DNS record has two key parts:

Firstly, the value portion of the DNS record you create has my proper domain name in the first section but with the dots replaced with dashes (so bobmckay.com becomes bobmckay-com).
Next, it has the tenancy domain name we retrieved above in step 2 on the end.

Troubleshooting

If you receive the following error message:

Create Dkim Cname Record Office 365

Strictly speaking this error means either the DNS records haven’t been configured properly or they haven’t had time to propagate but when I forced refreshed the entire page, the error suddenly went away so don’t trust repeatedly clicking the ‘enable’ link!

Dkim Example Office 365

You can verify your DKIM keys are available here: https://www.mail-tester.com/spf-dkim-check

Generate Dkim Key Office 365