: Use free services like Let's Encrypt to encrypt your connections. Lightweight & Specialized Alternatives

: Another highly flexible Linux MTA. It is the default mail server on many web hosting panels (like cPanel) because of its extensive customization options.

: You will need to configure MX , SPF , DKIM , and DMARC records to ensure your emails don't end up in spam folders.

: A popular, free, open-source email server for Windows . It is easy to install and supports all common protocols (SMTP, POP3, IMAP). You can download it directly from the official hMailServer website .

To successfully run a downloaded mail server, you generally need: