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The questions we get asked most.

Email

What are transactional email best practices?

What is a transactional email API?

What is an email API?

What is an email attachment size limit?

What is an inbound email API?

What is email threading, and how do replies stay together?

What is SMTP authentication?

What is SMTP, and how does it differ from IMAP?

What SMTP port should I use?

What SMTP port should I use?

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