ZeptoMail
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ZeptoMail is Zoho's focused take on transactional email, built specifically for sending time-sensitive messages rather than marketing. You get SMTP relay and REST API options with Zoho's infrastructure backing it. They keep the feature set lean, avoiding marketing tools that would dilute the transactional focus.
Fits well if you're already in the Zoho ecosystem (CRM, books, projects) and want email handling there too. ZeptoMail works best for teams that need reliability and simplicity without campaign features cluttering the interface.