Open source mail gateway

Here are some popular open-source mail gateways:

  1. Postfix: A widely used, highly configurable, and scalable mail transfer agent (MTA) that can be used as a mail gateway.
  2. Sendmail: Another popular MTA that can be used as a mail gateway. It's known for its flexibility and customization options.
  3. OpenSMTPD: A modern, open-source MTA that's designed to be secure and easy to use. It's a good choice for small to medium-sized organizations.
  4. Exim: A highly configurable and customizable MTA that's been around for a long time. It's a good choice for organizations that need a high degree of customization.
  5. Qmail: A secure and reliable MTA that's designed to be easy to use and configure. It's a good choice for small to medium-sized organizations.
  6. MailScanner: A mail gateway that's designed to scan incoming and outgoing email for viruses, spam, and other malware. It's a good choice for organizations that need to protect their email infrastructure.
  7. SpamAssassin: A popular open-source spam filtering system that can be used as a mail gateway. It's designed to detect and block spam emails.
  8. ClamAV: A popular open-source antivirus engine that can be used to scan email attachments for viruses and malware. It's a good choice for organizations that need to protect their email infrastructure.
  9. OpenDKIM: An open-source implementation of the DKIM (DomainKeys Identified Mail) protocol, which helps to prevent email spoofing and spam.
  10. OpenDMARC: An open-source implementation of the DMARC (Domain-based Message Authentication, Reporting, and Conformance) protocol, which helps to prevent email spoofing and spam.

Some popular open-source mail gateway distributions include:

  1. PostfixAdmin: A web-based administration interface for Postfix that makes it easy to manage mail accounts, domains, and other settings.
  2. MailScanner: A mail gateway that's designed to scan incoming and outgoing email for viruses, spam, and other malware.
  3. SpamAssassin: A popular open-source spam filtering system that can be used as a mail gateway.
  4. OpenSMTPD: A modern, open-source MTA that's designed to be secure and easy to use.
  5. Exim: A highly configurable and customizable MTA that's been around for a long time.

When choosing an open-source mail gateway, consider the following factors:

  1. Security: Look for a solution that has a good reputation for security and has been tested by the open-source community.
  2. Customization: Choose a solution that allows for easy customization and configuration to meet your specific needs.
  3. Scalability: Select a solution that can handle a large volume of email traffic and can scale as your organization grows.
  4. Ease of use: Choose a solution that has a user-friendly interface and is easy to manage and maintain.
  5. Community support: Look for a solution that has an active community of users and developers who can provide support and help with troubleshooting.