Top 7 Free & Open Source Email APIs & Tools for Developers [2025 Edition]
Last Updated: 29 Sep, 2025
In the digital age, email remains the undisputed king of professional communication. For software developers, integrating email functionality, whether for transactional notifications, marketing campaigns, or user verification—is a fundamental task. But rolling your own SMTP server from scratch is a complex and often unnecessary endeavor. This is where free and open-source (FOSS) email APIs and libraries shine. They provide the robust, tested, and scalable foundation you need to handle email seamlessly within your applications, all without locking you into expensive proprietary services or compromising on transparency.
Explain MSG & EML File Formats? How to Convert b/t Them via .NET, Java & Python?
Last Updated: 06 Aug, 2025
When working with Email file formats, you may encounter two common formats: MSG and EML. Both store email messages but differ in structure, compatibility, and usage. In this blog post, we’ll explore what they are, their features and differences, and how to convert between MSG and EML using various types of APIs and code examples.
What is an MSG File? The MSG file format is a proprietary format developed by Microsoft.
What are Popular Email File Formats & How to Choose the Right One?
Last Updated: 30 Jul, 2025
What are Email File Formats? An email file format refers to the specific structure or type of file used to store email messages. These formats dictate how email content is encoded, how attachments are handled, and how metadata such as sender, recipient, subject line, and timestamps are preserved. These formats ensure compatibility across different email clients, servers, and applications. Whether you’re backing up important emails, migrating to a new service, or sharing messages, understanding email file formats1 is essential.
Email File Formats at FileFormat.com
FileFormat.com is your one stop for guidance about file formats. Its unique combination of file format wiki, news and support forums give you the opportunity to get knowledge about file types and engage in fruitful discussions with file format community.
Email File Formats The Email file format category includes file formats that can be processed by mailing applications like Microsoft Outlook, Mozilla Thunderbird, Apple Mail and others. Let us have a look at some of these file formats.