<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <meta content="text/html;charset=ISO-8859-1" http-equiv="Content-Type"> </head> <body bgcolor="#ffffff" text="#000000"> Yes. Either Postfix or Sendmail for the MTA (I find Postfix easier), and either Courier-IMAP or Dovecot for the IMAP part. Either will scale to what you're talking about. Matter of fact, at the University of Washington (my alma mater) which has over 35,000 students, the MTA of choice was in fact Sendmail. The IMAP daemon was and still is, as you might imagine, UW-IMAP. :-) However, I would strongly recommend the use of Maildirs, which Courier-IMAP, Dovecot, and Postfix all support. Maildirs make a mail server even more scalable than the traditional MBOX format does, and maildir mailstores are more fault-tolerant. If you want to scale to 16,000+, then MS Exchange Server is about the worst way you can go. I say that as a former Exchange Server administrator and one who now watches our district wrestle with Exchange Server 2003 for 20,000+ staff. Their maintenance is hell. --TP <div class="moz-signature">_______________________________ Do you <a href="http://www.gnu.org">GNU</a>? <a href="http://www.cmosnetworks.com">Microsoft Free since 2003</a>--the ultimate antivirus protection! </div> Todd O'Bryan wrote: <blockquote cite="mid904774730711141337n50189684sd60009af96f7a15b@mail.gmail.com" type="cite"> <pre wrap="">Our district has about 16,000 employees of varying types and is currently using a web-based Exchange server to do email. The system is slow, clunky, and the database is getting full, so we've been told to clean out our mailboxes because they're going to delete all mail older than 30 days. My question is this--does anyone have experience with a system that will scale reasonably to that many users. If so, we have about 90,000 students. Know of a system that will scale that big? The head IT guy tells me that he was quoted a commercial cost of between $250k and $500k for a system that would handle us, and, while that doesn't surprise me, I think something effective could be done much more economically. I'm just wondering if there's anything I can point to and say, see! Todd _______________________________________________ K12OSN mailing list <a class="moz-txt-link-abbreviated" href="mailto:K12OSN@redhat.com">K12OSN@redhat.com</a> <a class="moz-txt-link-freetext" href="https://www.redhat.com/mailman/listinfo/k12osn">https://www.redhat.com/mailman/listinfo/k12osn</a> For more info see <a class="moz-txt-link-rfc2396E" href="http://www.k12os.org"><http://www.k12os.org></a> </pre> </blockquote> </body> </html>