You forgot to mention the fastest and most scalable solution there exists, which is Cyrus imapd, see http://asg.web.cmu.edu/cyrus/
Basically, it is maildir with a header database. It scales well for tens of thousands of very active users on a single small box, and has also support for clustering. I know of installations which serve many hundreds of thousands of users on a single host, so imagine what a cluster of them could do.
It doesn't do much to economize on space, but that's a non-issue. Anyone who is willing to keep dozens of megabytes in his mailbox is willing to pay for the privilege, and hard disk space is cheap. Anyway, I think that any mail system which does not preserve the rfc822 format all the way from sender to recipient is evil.
sendmail -bd will always try and deliver, even though no -q flag is set. This setup is extremely dangerous and will play right into the hands of the spammers.
Slashdot Mirror
You forgot to mention the fastest and most scalable solution there exists, which is Cyrus imapd, see http://asg.web.cmu.edu/cyrus/
Basically, it is maildir with a header database.
It scales well for tens of thousands of very active users on a single small box, and has also support for clustering. I know of installations which serve many hundreds of thousands of users on a single host, so imagine what a cluster of them could do.
It doesn't do much to economize on space, but that's a non-issue. Anyone who is willing to keep dozens of megabytes in his mailbox is willing to pay for the privilege, and hard disk space is cheap. Anyway, I think that any mail system which does not preserve the rfc822 format all the way from sender to recipient is evil.
sendmail -bd will always try and deliver, even though no -q flag is set. This setup is extremely dangerous and will play right into the hands of the spammers.