Boost GSuite & Office 365 Email Deliverability with DKIM Authentication

digital security Jun 29, 2020

Are you running into email deliverability issues with your GSuite & Office 365 account? If so, this article explains why DomainKeys Identified Mail (DKIM) authentication is so important.

DomainKeys Identified Mail (DKIM)?

DomainKeys Identified Mail (DKIM) helps ensure that destination email systems trust messages sent outbound from your custom domain and to help prevent spoofing.

What is email spoofing?

Email spoofing is when a user's email content is altered to make the message appear from someone or somewhere other than the genuine source. 

To prevent spoofing, DKIM adds an encrypted signature to the header of all outgoing messages.

Then, email servers that get signed messages use DKIM to decrypt the message header and verify the message was not changed after it was sent.

You should use DKIM in addition to SPF and DMARC to help prevent spoofers from sending messages that look like they are coming from your domain.

Do I have to use DomainKeys Identified Mail (DKIM)?

Both GSuite and Office 365 have default DKIM if you do not set one up. However, we recommend you use your own DKIM key on all outgoing messages.

According to Google,

If you don't generate your own DKIM domain key, Gmail signs all outgoing messages with this default DKIM domain key: d=*.gappssmtp.com

Messages sent from servers outside of mail.google.com won't be signed with the default DKIM key.

So how do I set up DKIM?

GSuite and Office 365 have a similar process for setting up DomainKeys Identified Mail (DKIM). 

GSuite DKIM steps: https://support.google.com/a/answer/174124?hl=en

Office 365 DKIM steps: https://docs.microsoft.com/en-us/microsoft-365/security/office-365-security/use-dkim-to-validate-outbound-email?view=o365-worldwide

Important Info

Regardless if you are using GSuite or Office 365, you'll need to update your CNAME record with your domain host.

If you are a Sierra Interactive user, reach out to support@sierrainteractive.com and they can help you update your CNAME record because it is managed by them on Cloudflare.

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