Does Updating SPF And Adding CNAME Will Affect The Mail Flow?
No, Adding the CNAME and updating the SPF record will not affect the mail flow for the domains but it will improve the mail and domain security. It totally depends upon the DMARC Policies that where the mails are going to land so updating SPF and adding CNAME will not affect the mail flow but will help organizations to get a view of which third party are using their domains to sending emails.
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