Free SMTP Server is a simple application that lets you send emails without needing to use a public SMTP server, which are overly simple or slow.
Free SMTP Server works well with the most known email clients, such as Thunderbird, Eudora, and Outlook Express (being especially optimized for Outlook Express), by only selecting SMTP server as your local host in your email account.
Although you can find active connections anytime, you can optimize the bandwidth of your connection by only using the excess to send emails with large attachments, and so not to affect navigation, it is recommended to close Free SMTP Server when you are not using it, plus there are those that are out to scan these ports so they can use your machine to send spam.