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What is MailCub? Transactional Email & Business Email Hosting

This page explains what MailCub is, its core email services, common use cases, and how its secure email architecture works.

MailCub is an all-in-one email service provider designed for modern applications and businesses. It enables you to send transactional emails, host professional business emails, or run a dedicated custom email server with full control.

MailCub Services at a Glance

  • Transactional Email Service – Send OTPs, password resets, and notifications via API or SMTP

  • Email Hosting – Secure business email hosting with custom domains

  • Custom Email Server – Dedicated email infrastructure for high-volume or compliance needs

Common Use Cases

  • SaaS application email delivery

  • OTP and authentication emails

  • Business communication with custom domains

  • High-volume and enterprise email sending

Architecture Overview

MailCub uses authenticated SMTP and REST APIs combined with DNS-based email authentication (SPF, DKIM, DMARC) to ensure maximum inbox placement and security.