Sender Policy Framework (SPF) is an email authentication mechanism that allows a domain to publicly state which IP addresses (email servers) are allowed to send email on its behalf. In order to be SPF aligned for DMARC, the visible "From" address and the "Header" or "Bounce" address must match. When sending through Constant Contact, it's not possible to pass an SPF alignment check since the "Header" or "Bounce" address is that of our email server (@in.constantcontact.com) and it will never match your visible "From" address.
Receiving mail servers check our domain's SPF record, not yours, so you do not need to add Constant Contact IP addresses to your SPF record if you have one. Don't worry - there is no requirement for SPF alignment to pass a DMARC check! When you set up self-authentication within your Constant Contact account and send from your custom domain email address, you'll be DKIM aligned for DMARC purposes.
If you still want to take this unnecessary step, you can add the following to your existing SPF record within your DNS settings:
include:spf.constantcontact.com
Please note: Adding this information to your SPF record will NOT enable a DMARC SPF alignment check to pass.
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