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Transactional Email Software

SMTP

Email relay and transactional email API for businesses sending from thousands to billions of messages

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About SMTP

SMTP is a transactional email and relay service that carries a company's automated messages to recipients' inboxes. It supports businesses sending from a few thousand messages up to billions. The provider says it has more than twenty years of email experience and offers support to customers worldwide.

What SMTP offers

SMTP relay and API — Email can be sent through a relay or an API, and a first send can happen within minutes of signing up.
Transactional email — Emails following up on activity, authentication messages, order and billing details, account updates and policy notices.
Reputation Defender — An optional add-on that watches list health and removes invalid addresses before sending, to protect domain and IP reputation.
Insight Engine — An add-on that enriches customer profiles with data so they can be engaged by email.
High volume sending — High volume senders get a dedicated instance in a private cloud, an account manager and a tailored IP warm-up plan.

Key facts

Experience: Over twenty years in email delivery
Support: Expert support for customers on any plan
Reviews: Verified reviews listed on G2

Profile written by TrustList from the business's own published information, Oct 2026.

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