Scott Silva wrote: > on 5-21-2009 11:33 AM Seth Mattinen spake the following: >> V S Rao wrote: >>> Hi Timo, >>> >>> Thanks for the response. Apologize, but my responses are going to be a bit >>> lengthy. >>> >>>> I have migrated from uw-imap to Dovecot for POP3 & IMAP service. I run >>>> webmail using squirrelmail. When running uw-imap I used to run >>>> up.imapproxyd on the webmail server for faster responses. After >>>> migrating to Dovecot, I find that up.imapproxyd does not work well >>>> with dovecot. >>>> Why not? >>> Here are my observations. I have around 6000+ mailboxes and roughly the >>> same number of users. Earlier the mail server (running sendmail + uw-imap >>> for POP3 & IMAP) would have around 80 pop3 connections (peak) and around >>> 300 IMAP connections, concurrent. >>> (ps -aef | grep imap | wc -l or ps -aef | grep pop3 | wc -l). There have >>> been cases where I have observed upto 500 concurrent IMAP sessions. >>> >>> The IMAP connections are from a webmail server running Apache with >>> Squirrelmail. The observation was that response was slow & so based on the >>> suggestion on Squirrelmail for performance improvement we have installed >>> up-imapproxyd on the squirrelmail machine. There was a significant >>> improvement in the response times for the users, because of caching. >>> >>> After that I encountered some strange problems of POP3 timing out for users >>> (earlier I did post that problem in this forum). I opened a ticket with >>> Redhat and naturally they refused to support me with uw-imap running. So >>> switched to Dovecot 0.99.x (I run the server on RHEL 4.0 and that is the >>> max version supported by Redhat for that version). Ever since I did that >>> POP3 works fine but now webmail is almost not available to the users. >>> People usually get "connection dropped by IMAP server". However the IMAP >>> server seems to work fine. Checked through manual "telnet >>> <ip.address.of.mailserver> 143 & also through other client such as outlook >>> & Thunderbird. >>> >> >> I realize you're using 0.99 because it's "supported" by RedHat, but in >> reality it's absolutely ancient history. There have been far too many >> performance enhancements/fixes between then and now to even begin to list. >> >> ~Seth >> > Besides, he didn't go to RedHat for support anyway. He came here. And here > says start with at least the latest 1.0 version, or maybe even 1.1. You can > get it from atrpms.net if you want an rpm. >
Yes, that too. My point was not to judge Dovecot's performance based on a 0.99 version. ;) I've successfully used several versions of dovecot 1.1.x with imapproxyd and IMAP-only webmail clients. ~Seth
