THE ADVANCED COMPUTING SYSTEMS ASSOCIATION The following paper was originally published in the Proceedings of the FREENIX Track: 1999 USENIX Annual Technical Conference Monterey, California, USA, June 6–11, 1999 Sendmail Evolution: 8.10 and Beyond Gregory Neil Shapiro and Eric Allman Sendmail, Inc. © 1999 by The USENIX Association All Rights Reserved Rights to individual papers remain with the author or the author's employer. Permission is granted for noncommercial reproduction of the work for educational or research purposes. This copyright notice must be included in the reproduced paper. USENIX acknowledges all trademarks herein. For more information about the USENIX Association: Phone: 1 510 528 8649 FAX: 1 510 548 5738 Email:
[email protected] WWW: http://www.usenix.org Sendmail Evolution: 8.10 and Beyond Gregory Neil Shapiro
[email protected] Eric Allman
[email protected] Sendmail, Inc. 6603 Shellmound Street Emeryville,California 94608 ABSTRACT SendmailTM has been the de facto mail transfer agent implementation since the dawn of the Internet. Today, sendmail development is still drivenbyacontinually changing set of network requirements and user demands. Lately,two new driving forces have also contributed to sendmail development. First, as more open source mail transfer agents, such as Exim and Postfix,become available, a newfriendly competition has developed in which the authors of the various MTAs share their ideas via open source and help to advance open standards as opposed to advancing their own particular implementation. Second, a new“hybrid” company, Sendmail, Inc., has been created to offer commercial versions of the open source software while continuing to fuel open source development.