If you want to allow Constant Contact to send emails on behalf of your domain, you need to set up SPF and modify the records to include constant contact. Without authorizing Constant Contact via SPF (and/or DKIM), emails may fail DMARC authentication due to lack of domain alignment.. In this article, you’ll get a thorough understanding about how to set up SPF for Constant Contact:
Log in to your DNS hosting provider (such as cPanel, GoDaddy, Cloudflare, etc.).
Navigate to the domain for which you want to setup SPF for Constant Contact
Now, If you have a pre-existing SPF record in your DNS:
You need to add include:spf.constantcontact.com to your previous SPF record. Hence, if your previous SPF record was v=spf1 include:_spf.google.com -all, your new record will be:
v=spf1 include:_spf.google.com include:spf.constantcontact.com -all
Note: Make sure you have a single SPF record configured for your domain. More than one record will invalidate your SPF completely.
Now, If you don’t have a pre-existing SPF record in your DNS:
Add the following DNS TXT SPF record to your DNS:
v=spf1 include:spf.constantcontact.com -all