Glossary entry
Double opt-in
The practice of requiring two confirmations before adding someone to an email list — initial subscribe form + confirmation email click. The deliverability + compliance gold standard for marketing lists. Reduces spam complaints, bot signups, and typo-emails. Less relevant for cold outbound (which by definition has no prior opt-in) but critical for marketing automation. Now legally required in EU + Canada for marketing lists.
01Definition
TLDR
The practice of requiring two confirmations before adding someone to an email list — initial subscribe form + confirmation email click. The deliverability + compliance gold standard for marketing lists. Reduces spam complaints, bot signups, and typo-emails. Less relevant for cold outbound (which by definition has no prior opt-in) but critical for marketing automation. Now legally required in EU + Canada for marketing lists.
02Why it matters
The difference between a marketing list that lands in inbox and one that lands in spam. Adoption pays for itself within 60 days.
03Example
Worked example
Webinar signup → user enters email → confirmation email sent → user clicks link → user added to nurture sequence.
Found something off? Glossary entries are reviewed in batches. If a definition is wrong, incomplete, or missing the angle that would help your team, email [email protected] and reference this entry — we'll revise and credit your input.
Signal-anchored outbound, no theater
Stop guessing. See every signal firing on every account in your CRM.
Connect a CRM. Mama detects 47 signal types, scores every account daily, and writes the first email. Free up to 100 accounts. No card.