---
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"@id": https://www.twilio.com/docs/glossary/smtp-service#article
headline: SMTP service
description: "*Email Deliverability*. Third-party managed service that delivers email messages to a large audience."
url: https://www.twilio.com/docs/glossary/smtp-service
inLanguage: en
dateModified: 2026-05-06T13:22:30.000Z
author:
  "@type": Organization
  name: Twilio Developer Education Team
publisher:
  "@type": Organization
  name: Twilio
---

# SMTP service

*Email Deliverability*. Third-party managed service that delivers email messages to a large audience.

As an alternative to maintaining an email infrastructure, an organization might select a vendor to manage large [email marketing][] [campaigns][]. These services can [manage subscribers][subs], help design emails, and track the results of the campaign.

They also have support teams available to answer questions and make fixes when needed.

[email marketing]: /docs/glossary/email-marketing

[campaigns]: /docs/glossary/campaigns

[subs]: /docs/glossary/subscriber-list-management