On Tuesday 15 May 2001 20:49, Haim Dimermanas wrote: > I am in the process of setting up an email system that will host > thousands of domains, many aliases per domain as well as forwarding > capabilities on a per-domain basis.
I am currently doing exactly the same thing. > As far as the MTA is concerned, my choice is postfix. After reading the > postfix-users mailing for a week (~60 msg a day), I think I got a good > feeling about how postfix works. I am working with LDAP and I have got a problem with Postfix. If I have an alias that expands to several local addresses which are also in LDAP then it will give LDAP timeouts inappropriately. In one test I had a reasonably fast machine (P3-650, 256M, 10G IDE hard drive but all data fit into the cache) and delivery to 6 mail boxes caused an LDAP timeout (timeout was 50 seconds). I believe that this may be a bug in Postfix and intend to fix it or report it if I can't fix it myself, but currently I have not been able to spare enough time to do either. Another option is Exim. I have been hearing many good things about it, I have been a totally satisfied Postfix user for some time and now I think that I should give Exim a test... > I am now confronted with choosing a good Local Delivery Agent. I heard > great things about Cyrus so I gave it a shot. After realizing that the > HOWTO was out-of-date (damn!) and that the Cyrus documentation was > somewhat cryptic, I am now considering Courier. I have heard reports that Cyrus doesn't scale well for more than 20,000 users. I want 100,000 or more so I think it won't do the job. Also Cyrus uses it's own database for mail storage. I don't want that, I want to use Maildir so that I can use the range of Maildir based utility programs. Courier is something that I am considering as I think it may do the job. > What I need is something that is scalable, reliable and working with a > database (MySQL first, maybe Oracle later on). Between Cyrus and > Courier, which one do you recommend? Please note that I am not trying to > start a flame war, I just need to make an important decision. I am using LDAP not a database. LDAP allows replication and OpenLDAP is free. Free databases don't do replication, and Oracle Parallel Server costs huge amounts of money. I want to have a network configured such that any machine can die without stopping the users from getting their mail. If the primary LDAP dies then users can't change their passwords until I switch one of the slaves to become master (5 minutes work). But not being able to change a password is no big deal. With a database back-end if the database server dies then you're stuffed. -- http://www.coker.com.au/bonnie++/ Bonnie++ hard drive benchmark http://www.coker.com.au/postal/ Postal SMTP/POP benchmark http://www.coker.com.au/projects.html Projects I am working on http://www.coker.com.au/~russell/ My home page
