On 10/03/02 20:42 +0800, Suresh Ramasubramanian wrote: > +++ Devdas Bhagat [linux-india] <10/03/02 17:51 +0530>: > > Courier is a good thing, but not always the best :). > > I would use Postfix/Exim for incoming, qmail/postfix(*) for primary > > sending and postfix/exim for the fallback relays. > > sendmail or exim for incoming, qmail / postfix for outbound. qmail is a > straightforward out and out DoS tool, some would say (open up several dozen > simultaneous connections to a remote host and kick the mail out ASAP). > Sendmail / Exim for inbound because of its excellent queue handling and Exim or postfix. Sendmail is slow. Unless the newer versions have done a major speed increase.
> configurablity (even Postfix would fit the bill). But as we don't deliver > locally on our MXs, but handoff to an internal cluster of qmail boxes, we > prefer sendmail, as qmail kind of sucks on inbound delivery. Incoming MTA != delivery MTA. Remote -> MX -> Delivery Client -> Outbound -> remote > > Courier would be for the imap server, and mail routing done through a > > database/ldap. > > Fair enough. LDAP may not scale for large loads - you'd need mysql or > postgres, ideally. However, our loads are *very* large :) Depending on how often users are added, it might be simpler to generate cdb/dbm files from the ldap data (virtusertable for sendmail, virtual_maps for postfix) and use those. The MTA never touches the database/LDAP, and this might scale rather better than LDAP itself. dbm maps == btree access, with a maximum of 3 disk seeks. cdb == static maps. Unless of course, you go into handling lots of simultaneous user addition and stuff, in which case, you migrate to a database. > In short, this is not a question of putting up a single colocated machine at > vsnl and expecting to run stuff on it. One or more /24s I guess ... Yeah. Minimally a /26, with really good admins (at least 5 admins for system+ 5 for network). This stuff isn't cheap :) Devdas Bhagat _______________________________________________ linux-india-help mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/linux-india-help
