- dovecot - dovecot.org

Re: [Dovecot] Dovecot proxy: Too many open files
by Bill Boebel 07 Aug '06

07 Aug '06

On Sun, August 6, 2006 4:40 pm, Timo Sirainen <tss(a)iki.fi> said: > On Wed, 2006-08-02 at 23:20 -0400, Bill Boebel wrote: >> It appears that when running Dovecot as a proxy-only box with >> "login_process_per_connection = no", it ignores the value of >> login_max_logging_users. > > Not really. It does enforce the maximum users _logging in_ limit, but > for that isn't counted SSL proxies or other proxies.. I rewrote this in > CVS. There's now login_max_connections setting which works pretty much > how expected. Ahh, ok. I will give it a try. Thanks, Bill

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[Dovecot] Dovecot proxy: Too many open files
by Bill Boebel 06 Aug '06

06 Aug '06

It appears that when running Dovecot as a proxy-only box with "login_process_per_connection = no", it ignores the value of login_max_logging_users. And in Linux, since each socket requires a file descriptor, if you don't increase the maximum number of open files that each process is allowed to have open, imap-login will reach the 1024 open file limit and start logging the following errors: imap-login: socket() failed: Too many open files imap-login: Internal login failure: user=... imap-login: socketpair() failed: Too many open files Here are the settings I am testing with: login_process_per_connection = no login_max_logging_users = 225 login_processes_count = 20 login_max_processes_count = 30 And here the output of "lsof -nu dovecot" when one of the imap-login processes reaches its open file limit. In this case PID 20087 had 362 users connected, but it should have allowed no more than 225 users, which would have kept it from reaching the open file limit: (sent directly to Timo since it was too big to post to the list) Also, I am running CVS dovecot-20060725. Bill

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[Dovecot] Using mail_chroot and default_mail_env
by Daniel Kauffman 06 Aug '06

06 Aug '06

Settings for mail_chroot and default_mail_env are not playing well together. It seems that default_mail_env is verified to exist *before* the chroot but is later used *after* the chroot. A configuration like this: * mail_chroot = /var/mail/example.com/username * default_mail_env = maildir:/Maildir Fails with the message: * stat(/Maildir) failed: No such file or directory As a work-around, I created an empty directory named Maildir *outside* of the chroot. The relevant portions of the filesystem now look something like this: * /Maildir * /var/mail/example.com/username/Maildir/... NOTE: The empty /Maildir directory is owned by root. NOTE: Each /var/mail/example.com/username directory and up is owned by root. NOTE: Each /var/mail/example.com/username/Maildir directory and below is owned by the email user. After successful testing with the "static" settings above, I was able to pull the per-user settings for mail_chroot in from PostgreSQL using home to over-ride mail_chroot. If anyone else has been having trouble with mail_chroot + default_mail_env, hopefully this work-around will help. Finally, I should mention my system, just in case I am the only one affected... * Xen + Linux 2.6.16.13 + Debian 3.1 + ( Dovecot 1.0rc2 in chroot ) Regards, Daniel Kauffman

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[Dovecot] ldap + dovecot
by Gert Horne 06 Aug '06

06 Aug '06

Hi again, I am still struggling with ldap and dovecot. I have my dovecot authenticating against ldap. The problem now seems to be of a permission type. I am also trying to figure out the default_mail_env and valid_chroot_dirs settings. may maillog gives me: IMAP(user): Ambiguous mail location setting, don't know what to do with it: /var/spool/mail/ (try prefixing it with mbox: or maildir:) server dovecot: IMAP(user): Failed to create storage with data: /var/spool/mail/ Can anyone help me please.

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[Dovecot] dovecot.conf
by Magnus Granberg 06 Aug '06

06 Aug '06

Can we move dovecot.config to /etc/dovecot/ ? MVH Magnus Granberg Ume.Nu

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[Dovecot] daemontools
by Rick Romero 05 Aug '06

05 Aug '06

Hi, I just started running RC2 on Thursday. I migrated an old Courier IMAP server, and the only issue I had was that I didn't understand how to enable quotas :) It's impressively fast, and I'm quite happy with it so far. This morning I found that dovecot had crashed, I had exceeded FreeBSD's kern.maxpipekva Has anyone successfully run dovecot under daemontools? I got it to fire up, but it didn't seem to work right.. I'm guessing it's a rights issue, but I haven't delved into it at all. Thanks! Rick

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[Dovecot] Dovecot proxy in front of UWash?
by Vincent Fox 05 Aug '06

05 Aug '06

Is it possible to use Dovecot frontends in front of UWash backends? I need a proxy pool ASAP. There is not sufficient time to migrate the backends for 40,000+ users so they have to stay UW for now. I have been looking at Perdition but concerned about performance under load. Dovecot looks really promising with it's non-forking mode. I need simple dumb frontends no local mail. Other questions: 1) Database? Wiki only talks about SQL, can I have it map username to hostname using LDAP or some other mechanism? 2) Kerberos? I am hazy here, but can I have the frontends auth the user via Kerberbos and things "just work"? Or do I need to stick with PLAIN authentication? 3) Port mappings? Can I have the requests coming in on SSL ports remapped to non-SSL ports on the backends? Thus the backends could have their load reduced somewhat. e.g. client->proxy:993->backend:143

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[Dovecot] mysql query prepending
by Chris Cappuccio 05 Aug '06

05 Aug '06

In postgresql you can do something like select 'maildir:' || maildir as mail, uid, ... through dovecot-sql.conf Is there a mysql equivalent for adding 'maildir:' as a prefix to the 'mail' location ?

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[Dovecot] Thunderbird and hanging "Copying message to Sent folder..."
by M.-A. Lemburg 04 Aug '06

04 Aug '06

Here's a work-around for the problem that appears to work and maybe also hints at the root of the problem: If you setup the Thunderbird account to "Place a copy in:..." "Other" and then select the Sent folder of the account (rather than just selecting "Sent Folder on: ..."), the problem appears to go away. I can't tell for sure, but Thunderbird seems to send the copy using a different connection than the one used for sending the message itself if you set things up in this way. The email still gets copied to the same Sent folder, so there's no change there. -- Marc-Andre Lemburg eGenix.com Professional Python Services directly from the Source (#1, Aug 03 2006) >>> Python/Zope Consulting and Support ... http://www.egenix.com/ >>> mxODBC.Zope.Database.Adapter ... http://zope.egenix.com/ >>> mxODBC, mxDateTime, mxTextTools ... http://python.egenix.com/ ________________________________________________________________________ ::: Try mxODBC.Zope.DA for Windows,Linux,Solaris,FreeBSD for free ! ::::

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[Dovecot] Stale imap processes
by Fran Fabrizio 04 Aug '06

04 Aug '06

Anyone have any theories or experiences as to why for a certain user, some of his imap processes hang, and stay around for days and days? He just reported that his Thunderbird was timing out when trying to open folders, I looked on the server, and he had 3 old imap processes from 1 week+ ago. I killed those and his performance immediately improved. He checks mail with Thunderbird > 1.5 from both Win and Linux, Squirrelmail webmail, and pine. Of those, pine is the only one that is somewhat rare around here - any specific problems with pine's imap client code that anyone knows about? We have been using the dovecot-1.0-0.beta2.7 rpm for Fedora Core 5, I'm updating to 1.0-0.beta8.2.fc5 to see if that helps, as well. Just curious if anyone else has seen this lately. Thanks, Fran -- Fran Fabrizio Senior Systems Analyst Department of Computer and Information Sciences University of Alabama at Birmingham http://www.cis.uab.edu/ 205.934.0653

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