What is ARC, or Authenticated Received Chain?

ARC, or Authenticated Received Chain, is a standard created in 2016 to help improve how DKIM and SPF results are passed from one mail server to the next during forwarding. When messages are passed to intermediaries like mailing lists or email account forwarding, DKIM and SPF can break. ARC aims to fix this.

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Don't send unsubscribe confirmation emails

When a user opts out or unsubscribes from your emails, you should never follow up with a confirmation email letting them know you will not email them again. What ultimately happens is the user will be completely turned off and mark your “Unsubscribe Confirmation Email” as spam.

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From , the team behind Postmark