quickSMTP

quickSMTP is a free and open source email server that you can host on your own computer. This gives you full control over your email without having to rely on your service provider's email client.

quickSMTP supports full SMTP and POP3 with authentication, unlimited hosted domains and email boxes, and the ability to define a range of allowed or blocked IP addresses. You can also use quickSMTP to send email from anywhere using SMTP authentication.

quickSMTP is easy to install and use. Just download the software and install it on your computer. You can then configure quickSMTP to suit your needs.