Email opt-in confirmation

Twilio SendGrid recommends confirming email opt-ins as a best practice to help prevent invalid email addresses from being added to your email lists. Confirming opt-ins means that all new email address added to your mailing list are first sent a message prompting the recipient to click an included link. This verifies that the email address exists and is monitored, spreads out bounces related to bad email addresses, and ensures that the registrant is the owner of the inbox and wants to receive your content.

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