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seanosullivanuk/customdomaindkim.ps1

Created September 26, 2020 19:32
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Enable DKIM on a custom domain, with Microsoft 365 Exchange Online
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customdomaindkim.ps1
# First, create a new DKIM Signing config for your custom domain
New-DkimSigningConfig -DomainName novelica.co.uk -Enabled $true
# Next, output the necessary CNAME records you need to create
Get-DkimSigningConfig -Identity novelica.co.uk | Format-List Selector1CNAME, Selector2CNAME
# Once the CNAME records are in your DNS, enable DKIM signing
Set-DkimSigningConfig -Identity novelica.co.uk -Enabled $true
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It's fairly easy to work out the CNAME formatting ahead of time if you have a number of these to do. So long as the right CNAME's are in your DNS ahead of time, you only need to run the New-DkimSigningConfig commandlet, as it will check for the CNAME's and enable the config if they're there.

e.g. for contoso.com:

selector1._domainkey with the Content set to selector1-contoso-com._domainkey.contosocom.onmicrosoft.com
selector2._domainkey with the Content set to selector2-contoso-com._domainkey.contosocom.onmicrosoft.com

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