CheckeredFlag is a super simple mail server. The intended use is for local application
development that needs to be able to send email. CheckeredFlag runs on the local
machine and doesn't need a network connection nor any special set up. Just run
it and that is all. SMTP, POP, and webmail are provided, which means you can send email with any email client and recieve email with just about every email client.
There are no 4 star reviews.