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UniOne.io

API-based solution for transactional emails that is enabled to be integrated into any website or CRM system effortlessly.

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Top 3 Open-Source Alternatives to UniOne.io

Mailgun Exim OpenSMTPD

Product categories

Email Email Delivery Email Marketing Email Marketing Platforms MTA Newsletter Marketing SMTP Server Transactional Email

Summary

The top open-source alternatives to UniOne.io are Mailgun, Exim, and OpenSMTPD. One of the criteria for ordering this list is the number of mentions that products have on reliable external sources. You can suggest additional sources through the form here.
  1. Mailgun Landing Page
    Mailgun Landing Page
    1

    Mailgun

    A set of powerful APIs that enable you to send, receive and track email from your app effortlessly whether you use Python, Ruby, PHP, C#, Node.js or Java.
    Pricing:
    • Open Source

    #Email Delivery #Transactional Email #Email Marketing 11 social mentions

  2. Exim Landing Page
    Exim Landing Page
    2

    Exim

    Exim is a message transfer agent (MTA) developed at the University of Cambridge for use on Unix systems connected to the Internet.
    Pricing:
    • Open Source

    #SMTP Server #Email #MTA

  3. OpenSMTPD Landing Page
    OpenSMTPD Landing Page
    3

    OpenSMTPD

    OpenSMTPD is a FREE implementation of the server-side SMTP protocol as defined by RFC 5321, with...
    Pricing:
    • Open Source

    #SMTP Server #Email #MTA 2 social mentions

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