February 2008 - dovecot

[Dovecot] on dovecot quota.
by Mauro Sanna 25 Feb '08

25 Feb '08

Is it true that if a user reaches quota limit he isn't be able to delete his messages to free his mailbox space?

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[Dovecot] Authentication using multiple password schemes
by hever＠web.de 25 Feb '08

25 Feb '08

Hi there, I tried to patch the actual Dovecot 1.1 rc1 with the http://dovecot.org/patches/1.1/auth-multi-password.diff. The patch doesn't work for this version and I don't want to get an old version. Is this patch perhaps in the 1.1 rc1version included? I'm not sure because I don't really know how it's to use. I thought about returning some password fields from a database. If not could someone provide a working patch ? I need this patch because I'm going to provide NTLM and CRAM-MD5 POP/IMAP authentication because Outlook doesn't support CRAM-MD5 as non-plaintext authentication and I don't want store plaintext passwords. _______________________________________________________________________ Jetzt neu! Schützen Sie Ihren PC mit McAfee und WEB.DE. 30 Tage kostenlos testen. http://www.pc-sicherheit.web.de/startseite/?mc=022220

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[Dovecot] mbox with two storage locations
by Bill Pitz 25 Feb '08

25 Feb '08

Hello, I'm trying to migrate a legacy system to Dovecot in which I need to support mbox format storage with the following parameters: Inbox is in: /var/spool/mail/%u Additional mail folders are stored in: /var/spool/mail2/%u (i.e. Spam, Sent, Trash, Drafts, etc.) /var/spool/mail and /var/spool/mail2 are configured with the same permissions. (Read/write/execute user root, Read/write/execute group mail). I've added mail as an additional group in the Dovecot configuration. # dovecot --version 1.0.10 # 1.0.10: /etc/dovecot.conf ssl_cert_file: /etc/pki/dovecot/certs/dovecot.pem ssl_key_file: /etc/pki/dovecot/private/dovecot.pem login_dir: /var/run/dovecot/login login_executable: /usr/libexec/dovecot/imap-login first_valid_uid: 100 mail_extra_groups: mail mail_location: mbox:/var/spool/mail2/%u:INBOX=/var/spool/mail/%u:INDEX=MEMORY auth default: passdb: driver: pam userdb: driver: passwd The problem is what when I run this configuration, I am not able to see any of the contents of /var/spool/mail2. I ran around with this problem for a while and ultimately found that the following fixes it: cp -Rpfd /var/spool/mail2 /home Change Dovecot to use /home/mail2/%u instead: # 1.0.10: /etc/dovecot.conf ssl_cert_file: /etc/pki/dovecot/certs/dovecot.pem ssl_key_file: /etc/pki/dovecot/private/dovecot.pem login_dir: /var/run/dovecot/login login_executable: /usr/libexec/dovecot/imap-login first_valid_uid: 100 mail_extra_groups: mail mail_location: mbox:/home/mail2/%u:INBOX=/var/spool/mail/%u:INDEX=MEMORY auth default: passdb: driver: pam userdb: driver: passwd Further investigation revealed that no path outside of /home would work for the storage of the mbox directory. Any ideas? Everything seems to work great except for this one (pretty major) issue. Also, /home, /var, and / are separate filesystems. I'm not sure if that's playing into this or not (doesn't seem like it, since it seems to have no issue storing INBOX in /var/spool/mail). Thanks, -Bill

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[Dovecot] 1.1rc1: Maximum number of mail processes exceeded
by Ralf Hildebrandt 25 Feb '08

25 Feb '08

I'm getting "Maximum number of mail processes exceeded" messages when 512 imap Processes are active. Dovecot reports: Warning: fd limit 1024 is lower than what Dovecot can use under full load (more than 1712). Either grow the limit or change login_max_processes_count and max_mail_processes settings But in my /var/service/dovecot/run script I use: #!/bin/sh mkdir /var/core chmod 1777 /var/core echo /var/core/%p > /proc/sys/kernel/core_pattern ulimit -n unlimited ulimit -c unlimited /usr/local/sbin/dovecot -F So how can I raise the filedescriptor limit above 1024 (linux-2.6.24.2, Debian)? -- Ralf Hildebrandt (Ralf.Hildebrandt(a)charite.de) snickebo(a)charite.de Postfix - Einrichtung, Betrieb und Wartung Tel. +49 (0)30-450 570-155 http://www.arschkrebs.de StGB SS328 Absatz 2.3: Mit Freiheitsstrafe bis zu f�nf Jahren oder mit Geldstrafe wird bestraft, wer eine nukleare Explosion verursacht

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Re: [Dovecot] Dovecot Sieve scalability
by Jan van den Berg 25 Feb '08

25 Feb '08

Hi, What exactly do you mean with "deliver preps the index"? Dovecot itself preps/creates/alters the index, when retrieving mail; right? Or are you (probably) saying this is one more benefit of using 'deliver'. Anyone know of any 'deliver'/(dovecot) stresstests with regards to forking and threading of the deliver binary? Cheers, Jan -----Oorspronkelijk bericht----- Van: Gabriel Millerd [mailto:gmillerd@gmail.com] Verzonden: zaterdag 23 februari 2008 4:01 Aan: Jan van den Berg Onderwerp: Re: [Dovecot] Dovecot Sieve scalability On Fri, Feb 22, 2008 at 2:55 AM, Jan van den Berg <jan.vandenberg(a)isp.solcon.nl> wrote: > > The Dovecot/Sieve implementation is functional but not very elegant or > robust. But this can be explained because Dovecot is build for > _retrieving_ mail (imap/pop) and _not_ delivering mail. > Deliver preps the index, makes retrieving email faster. More so for the average disorganized INBOX in my only folder customers. Sieve makes a lot of things smoother for users, the customer. Especially if they expect server side rules. Obviously the rules that drop each message into a Backups or forward messages to other hosts take up what they take up. My sievec files have ancient mtimes. They are definitely not recompiled upon receiving each email. > Any thoughts on this? Are there people out there with large > Dovecot+Sieve implementations (100k+ users). Are there benchmarks > available; how well does it perform under heavy load (mails/sec)? > Depends entirely on the sieve rules in place. -- Gabriel Millerd

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[Dovecot] Dovecot Sieve scalability
by Jan van den Berg 25 Feb '08

25 Feb '08

Hi, I just finished setting up a functional design with Dovecot+Sieve and it works like a charm. However I'm having serious doubts about the scalability of this. Here is part of a discussion we're having here: About Dovecot+Sieve. What happens here is that your MTA is configured to pass _all_ email to Dovecot which is configured as a LDA. In practice this means this in the Exim config: command = /usr/local/dovecot/libexec/dovecot/deliver So you call on a single binary "deliver". This binary then looks for a .dovecot.sieve file in the user maildir, _compiles_ it to .dovecot.sievec file, and than drops the mail according to the rules. Calling a single binary: that's isn't threaded, doesn't fork, and that has to compile a file (everytime?) it's called isn't scalable. Multiply this with 100 mails(calls) per second and this is bound for problems. The Dovecot/Sieve implementation is functional but not very elegant or robust. But this can be explained because Dovecot is build for _retrieving_ mail (imap/pop) and _not_ delivering mail. Any thoughts on this? Are there people out there with large Dovecot+Sieve implementations (100k+ users). Are there benchmarks available; how well does it perform under heavy load (mails/sec)? Cheers, Jan

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[Dovecot] error pop email
by indra wardhana 25 Feb '08

25 Feb '08

i got error when downloading the email using pop. the message is "The RETR command did not succeed. Error retrieving a message. Mail server responded: ity: 3 (Normal) server dovecot-1.0.10 (debian etch-backports package) client mozilla thunderbird-1.5.0 (debian etch package) any advice ? tq

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[Dovecot] Trash plugin after upgrade to 1.1rc1: Namespace not found for mailbox 'Spam mailbox is emptied before Trash'
by Ralf Hildebrandt 24 Feb '08

24 Feb '08

>From my log: Feb 23 19:48:27 postamt dovecot: IMAP(username): trash: Namespace not found for mailbox 'Spam mailbox is emptied before Trash' Yeah, that line read: # Spam mailbox is emptied before Trash The comment is being ignored :) -- Ralf Hildebrandt (Ralf.Hildebrandt(a)charite.de) snickebo(a)charite.de Postfix - Einrichtung, Betrieb und Wartung Tel. +49 (0)30-450 570-155 http://www.arschkrebs.de It's not that I'm so smart , it's just that I stay with problems longer. -- Albert Einstein

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[Dovecot] Update from 1.0.10 -> 1.1rc1 Inverted quota warning values?
by Ralf Hildebrandt 23 Feb '08

23 Feb '08

I used 1.0.10 with the quota-rewrite patch for v1.0. With that, I configured: quota_warning = storage=10%% /usr/local/scripts/quota-warning 90 quota_warning2 = storage=5%% /usr/local/scripts/quota-warning 95 quota_warning3 = storage=1%% /usr/local/scripts/quota-warning 99 with 1.1, the logic for the quota_warning entries changed (http://wiki.dovecot.org/Quota/New) quota_warning = storage=95%% /usr/local/bin/quota-warning.sh 95 quota_warning2 = storage=80%% /usr/local/bin/quota-warning.sh 80 Is that really correct (I admit, the new way is more intuitive to me). -- Ralf Hildebrandt (Ralf.Hildebrandt(a)charite.de) snickebo(a)charite.de Postfix - Einrichtung, Betrieb und Wartung Tel. +49 (0)30-450 570-155 http://www.arschkrebs.de "Java is, in many ways, C++--." - Michael Feldman.

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[Dovecot] Maildir Subsystems
by Aaron Wiebe 22 Feb '08

22 Feb '08

Greetings - new to the list, so apologies of I'm asking questions that have been brought up before. I work for a large email provider, currently using qmail, vpopmail and courier-imap. We tend to make fairly regular customizations of the software, and if you folks have any knowledge of courier's code layout, you probably can understand why we hate working on it. Anyway, I am looking at the possibility of migrating to dovecot, after a quick review of the code layout. It is MUCH nicer to read. But I have a few specific questions: 1. We customize our maildir system fairly heavily, and I'm wondering where the maildir code is located. Specifically, anywhere the app actually does work on disk related to folders, mail content and quotas. While I have reviewed the code in brief, I thought it would be easier to poke this list to get pointed in the right direction. 2. Courier works quite well over NFS for us, and I'm curious why your documentation covers NFS more specifically. What aspects of the filesystem are normally used that don't translate easily to work over NFS? Do you use stuff like inotify or atimes? 3. If anyone has any suggestions on how to migrate tens of thousands of imap users from courier to dovecot in a few hour window, I'd like to hear them :) Thanks, Aaron Wiebe

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