Marketing email
One-to-many email sent on the senders schedule.
Marketing email is broadcast or behavior-triggered email used for promotion, lifecycle nurturing, or newsletters. Engagement metrics drive sender reputation more than for transactional, and recipient consent (CAN-SPAM, GDPR) is non-negotiable.
reading this as developers picking email infrastructure
The question here is which one a backend engineer would rather operate. That means SDK depth in the language already in use, whether a retry can safely be replayed, how much the event log tells you when a customer says the email never arrived, and whether the pricing curve stays sane as volume grows.
Applied to marketing email, that means weighing developer experience, SDK breadth, idempotency keys, and operating track record ahead of the rest, against password resets, receipts, and magic links shipped from application code.