ArgoSoft Mail Server is described as 'Powerful and simple SMTP/POP3/Finger server, with built in Web interface for accessing mail via Web browser. Supports security features, such as SMTP authentication. Has built-in TZO client for users without static IP address. Version 1.8.8' and is an app in the Online Services category. There are seven alternatives to ArgoSoft Mail Server for Windows, Linux, Mac, Self-Hosted solutions and Java. The best alternative is hMail Server, which is both free and Open Source. Other great apps like ArgoSoft Mail Server are MailEnable (Freemium), Sendmail (Free, Open Source), Microsoft SMTP Server (Paid) and PowerMTA (Paid).
Sendmail is a general purpose internetwork email routing facility that supports many kinds of transfer and delivery methods, including the Simple Mail Transfer Protocol (SMTP) used for email transport over the Internet.
Configure SMTP e-mail in IIS when you want to deliver e-mail messages from your site. Mail can be delivered immediately or it can be delivered to a file location on disk where it can be retrieved for delivery later.
Email gateway application (SMTP server) that makes it easy for senders to adopt the latest authentication specifications ( SPF and DKIM) to comply with changing ISP policies for accountable outbound email delivery. No over hype. It just delivers.