Is double opt-in mandatory?

Not Universally Mandatory. Double opt in is best practice and sometimes required (German law), but not mandated by CAN-SPAM, GDPR, or CASL. These regulations require valid consent without specifying double opt in specifically.

Double opt in provides stronger consent documentation and list quality. It is recommended as best practice regardless of legal requirement.

Even without legal mandate, double opt in is wise for consent proof, list quality, and deliverability. Implement it for good practice even where not technically required.

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