In 1981, Eric Allman developed sendmail to route messages between disparate mail systems. Two years later, in 1983, sendmail version 4.2 was shipping with 18 different vendor UNIX systems.
Pfizer, Mail.com, Lucent, Nortel, GTE, Charles Schwab and many others. Sendmail, Inc.'s business is based upon two key components, Mail Routing and Mail Hosting. Sendmail is available for all versions of UNIX and Microsoft Windows NT platforms and accounts for 75% of the Internet's Message Transfer Agents (MTA). In a corporate environment, sendmail typically resides in two areas: 1) behind the firewall routing Inbound and Outbound Internet mail between the primary mail servers, and 2) at the firewall to