Hello @LindaZ93 ,
If your emails' From address is using a private domain - for example, emails directly from our business use @constantcontact.com for the domain - then these changes will be affecting you. For more info on the changes, I'd definitely recommend taking a look at this AMA post on the changes, and following along with our article on setting up self-authentication.
If your From address is using a free domain - Yahoo, AOL, Verizon, Gmail, Outlook, iCloud, etc. - then you won't be affected by these changes.
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