CritSend's full SMTP relay service and API ensures inbox delivery for your transactional mails. Never worry about email compliance, deliverability, IP reputation or blacklisting.
CritSend is a SMTP relay featuring a deliverability engine that automatically handles all aspects of email delivery, from compliance and headers to full unsubscription management and bounce processing. Advanced filters provide early spam detection, messages are sent with valid signatures from whitelisted servers, never worry about IP reputation or blacklisting.
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