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Transactional email, explained
SPF, DKIM and DMARC: a practical setup guide
What SPF, DKIM and DMARC do, how to publish each DNS record, and how to roll out DMARC safely so your transactional email reaches the inbox.
deliverabilitydns
Transactional vs marketing email: what's the difference?
Transactional and marketing email have different purposes, rules and sending infrastructure. Learn how to tell them apart and why you should keep them separate.
basicsdeliverability
SMTP vs REST API for sending email: which should you use?
Compare SMTP submission and an HTTP email API on integration effort, error handling, retries and idempotency, and choose the right one for your application.
smtpapi