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    Technical

    Transactional Email

    A one-off email triggered by a specific user action — receipts, password resets, shipping notifications.

    Transactional emails are functional, not promotional. They are usually sent through a separate API (SendGrid, Postmark, AWS SES, Brevo, Mailgun) optimized for speed and deliverability. Mixing transactional and marketing email on the same domain or IP can hurt the deliverability of both — best practice is to separate them.

    Related terms

    ESP (Email Service Provider)

    A platform that lets you send marketing email at scale — Mailchimp, Kit, ActiveCampaign, Klaviyo, etc.

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