Cllavio — Email Marketing & SMTP API for Startups (Free Plan)
It is an open source IMAP and POP3 email server for Linux/UNIX-like systems, written with security primarily in mind. It is an excellent choice for both small and large installations. It's fast, simple to set up, requires no special administration and it uses very little memory. | Email marketing that actually lands: campaigns + SMTP API, deliverability guardrails (SPF/DKIM/DMARC), analytics, and transparent pricing. Start free. |
Flexible authentification; Easy migration; Self-optimizing | email marketing, campaigns, transaction emails, simple prices |
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It is a free and open-source mail transfer agent that routes and delivers electronic mail. It is Wietse Venema's mail server that started life at IBM research as an alternative to the widely-used Sendmail program. Now at Google, Wietse continues to support it.

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250ok is an email deliverability tools company that produces a Software‐as‐a‐Service (“SaaS”) platform to monitor and measure the deliverability of email networks. These networks consist of companies sending various forms of messages including marketing, transactional, share, and others from various platforms.

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Pinpoint email issues before you hit "send". Secure your emails from malicious actors and ensure your email delivery to the inbox.
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It helps new brands and startups build an audience while they focus on building a product

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It offers a simple REST-based JSON API enabling you to thoroughly check and verify email addresses right at the point of entry into your system.