It is important to have a good email reputation, in order that your messages are not being marked as spam, and miss the recipient’s inbox. If you are using an email service, they will often provide you with recommended settings. For example, Google provides settings for SPF, DKIM, and DMARC. In addition to your usual email provider, it is also best to add records for other domains sending email on your behalf, such as mailchimp.

If your website is not actively being used for sending email. It is important to let the world know that any email they receive from your domain is being impersonated. In this case, you can set the appropriate records as recommended at CLOUDFLARE.