On Tue, Jan 16, 2007 at 08:15:09AM +0100, Daniel Lorch wrote:
Hi
I'd use qmail-ldap on UNIX for it. It's as stable and as scalable as you can get. The largest installation I know of has more than 3 million actual users on it in a large cluster. But then I'm biased. The only thing coming close to it in scalability is Critical Path. Both Yahoo Mail and Google Mail (Gmail) started off the qmail-ldap code base. Rediff mail in India is running qmail-ldap with some modifications. The last time I got information it was above 2 mio. active mail accounts.
Does qmail still suffer from the "delayed bounces problem" (see http://www-dt.e-technik.uni-dortmund.de/~ma/qmail-bugs.html#delayedbounce ) in this configuration or did you managed to work around it?
This is not an issue in qmail-ldap. Both recipient and sender can be verified and so mails to non-existant users are bounced in the smtp connection.