EmailRelay
EmailRelay is a small SMTP and POP3 server for Windows and Linux. It provides the server software needed to use the SMTP and POP3 email protocols, while emphasizing a small footprint and easy configuration. It is intended for individuals or organizations that need an email server on a Windows or Linux system and prefer a straightforward program rather than a larger, more complex package. No specific paid product is identified as a direct replacement for EmailRelay. Its main stated limitation is its platform scope: the available information names Windows and Linux, so users looking for software specifically described for another operating system will not find that support confirmed here. The program is also presented simply as an SMTP and POP3 server; no other email protocols, platforms, or broader mail-server functions are specified.