- dovecot - dovecot.org

[Dovecot] stats plugins causing dns lookup per connection
by Kelsey Cummings 14 Mar '13

14 Mar '13

I noticed our imap servers were generating a lot of A record lookups for their own IP's the other day and just got around to tracking down the source. Seems like they are all being caused by guid_128_generate() - perhaps the lookup could be cached at start up or it could just use make use of the hostname rather than spending the effort to get the IP via gethostbyname() calls. The function is used in a few other places too, so this might help more than just the stats plugin. nscd and/or host entries mitigate the total time spent on the lookup of course, but it seems unnecessary. -- Kelsey Cummings - kgc(a)corp.sonic.net sonic.net, inc. System Architect 2260 Apollo Way 707.522.1000 Santa Rosa, CA 95407

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[Dovecot] Sieve mark message as read
by Donny Brooks 13 Mar '13

13 Mar '13

I am trying to get the advanced functionality of managesieve working for our users. If this is not the proper place to ask this, please just say so. I have enabled sieve and it works just fine for basic moving messages to folders. However the problem comes in to play when a user selects something like "delete" or "mark as read" in the filter. It just simply does not do that function. I have installed the imapflags and imap4flags and added the needed parts to the dovecot config but it still does not seem to work. We are running Centos 6.3 with dovecot-2.0.9-2.el6_1.1.x86_64 and dovecot-pigeonhole-2.0.9-2.el6_1.1.x86_64 installed. What could I be missing to make this work? -- Donny B.

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[Dovecot] Qmail-LDAP/Dovecot Cluster
by Jeff Hardy 13 Mar '13

13 Mar '13

Hello, I have worked with qmail-ldap and Dovecot for a number of years, and recently wrote up a piece going into great detail about all aspects of our environment. It currently supports a rather small installation of ~10K active users. If it should be of interest: http://fritz.potsdam.edu/projects/email It is intended primarily for system administrators or mail administrators interested in building mail infrastructure on top of open-source technologies, and is inspired by the likes of Life with qmail. Topics include storage, backup, directory integration, local and remote mail exchange, checkpassword SMTP-Auth and Dovecot login, RBLs, content-scanning and anti-spam, quarantine, webmail, etc. Full installation directions and configuration stanzas are provided for nearly every piece of the infrastructure. Comments/criticism welcome. Cheers. -Jeff -- Jeffrey M Hardy Network / Systems Administrator hardyjm(a)potsdam.edu

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[Dovecot] mail_max_userip_connections
by Simon Brereton 13 Mar '13

13 Mar '13

Hi Sometimes, I hit mail_max_userip_connections limit. As far as I know I'm the only person that does, but I would like to find out why before someone else hits the limit. Is there a command available that can list the connections per IP? I'd like to find out which client is causing this. Or do you have a better suggestion? Should I just raise the limit (it's still at the default 10, which I never changed). What are the implications of this. Thanks. Simon

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[Dovecot] Limiting size of stored emails
by Patrick Joy 13 Mar '13

13 Mar '13

Hi, Would appreciate some advice on this issue. I'm running dovecot version 1.0.10 on ubuntu 8.04 LTS. Recently a user created a draft email in their client (outlook) and added a 4GB attachment. The email was uploaded to the draft imap folder on the server. After this the client would then go into a endless synchronisation loop every time outlook was opened. For example in the most recent case 400GB of data was downloaded to the client when the user left outlook synchronising for 5 days. I know this may be a bug with the client or client os however I would like to know if there is a way to limit the size of individual emails that can be stored in the imap store to prevent users creating huge drafts. There is no reason they should need an email draft of this size as it can never be sent through SMTP. Thanks

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[Dovecot] Documentation Clarification
by andreas＠cymail.eu 12 Mar '13

12 Mar '13

Can somebody please clarify the following in the documentation? I am actually looging at the 2.x docs: In the http://wiki2.dovecot.org/Authentication file there is a good effort to clarify between authentication mechanisms and password schemes. The authentication mechanisms are described in http://wiki2.dovecot.org/Authentication/Mechanisms. That is fine. But then looking at the http://wiki2.dovecot.org/Authentication/PasswordSchemes there is a section "Non-plaintext authentication mechanisms" which looks to me to be a repeat of what there is in the description of the authentication mechanisms. This section lists one more mechanism, LANMAN. Can somebody explain why this section is in this file? And which of the two is applicable. Thank you Andreas

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Re: [Dovecot] Integrating with Drupal SQL db
by Andreas Meyer 12 Mar '13

12 Mar '13

Hello! I took the thread back to the list. Tobias Rådenholt <tobias.radenholt(a)stos.se> wrote: > I think it is ssha512 hashing. It's not stos.se that's affected. It's > swedishschoolinsydney.org.au Just found this: capabilities are 'IMAP4rev1 LITERAL+ SASL-IR LOGIN-REFERRALS ID ENABLE STARTTLS LOGINDISABLED' meaning you can log in via STARTTLS but not via plaintext authentication. Does it have something to do woth your problem? > Mar 11 16:18:01 SSiS dovecot: imap-login: Disconnected: Too many invalid > commands (auth failed, 1 attempts): user=<Teacher1>, method=PLAIN, > rip=127.0.0.1, lip=127.0.0.1, secured > Thanks! > /Tobias Andreas > <info(a)stos.se> wrote: > > > Hi > > > > I'm trying to get Dovecot to use Drupal users password for authenticating > > IMAP users. But I just cant figure out how to make Dovecot understand the > > password hash type that Drupal 7 is using. > > > > My example user with password Teacher1 looks like this in Drupal database: > > $S$DZwJa.U8HXT2PvTmwCK13rGEYEvnx5DB6/hlqnfCBum4s4U7MVWU > > This is not CRAM-MD5, is it? > > > Dovecot retrieves this hash but complains that its not a recognized hash > > type, or that the hash is wrong, depending on if I change the default hash > > type in Dovecot config. > > > > Any help appreciated. > > This is what I get connecting to your server: > Connected to stos.se. > Escape character is '^]'. > * OK [CAPABILITY IMAP4REV1 NAMESPACE ID AUTH=PLAIN AUTH=LOGIN UIDPLUS STARTTLS ACL METADATA] Debian-60-squeeze-64-minimal IMAP4rev1 Citadel 7.83 ready > > This is what I get connecting to mine: > * OK [CAPABILITY IMAP4rev1 LITERAL+ SASL-IR LOGIN-REFERRALS ID ENABLE IDLE STARTTLS AUTH=PLAIN AUTH=CRAM-MD5] Dovecot ready. > > I see no AUTH=CRAM-MD5 in capabilites of your server. > > Andreas

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[Dovecot] dovecot virtual user 'unknown'...
by Dr Michael Daly 12 Mar '13

12 Mar '13

Hi I have a problem whereby Dovecot 1.0.7 is reporting that a recently setup virtual user in /etc/dovecot_passdb is 'unknown'. I have been trying to setup the user 'info' in a plaintext passwd-file /etc/dovecot_passdb as a virtual user, ie non system user. I suspect I have not properly setup 'info' as a virtual imap user... if so, how should I do this? Existing system users are in '/etc/passdb' and authenticate without problems. System users have their home directory in /home/system_user1/mail/.imap eg /home/system_user1/mail/.imap/INBOX ...file is /var/spool/mail/systemuser1 /home/system_user1/mail/.imap/Sent ... file is in /home/system_user1/mail/Sent /home/system_user1/mail/.imap/Drafts... file is in /home/system_user1/mail/Drafts whereas the postfix virtual user's (username is 'info') mailbox is configured as... call it /var/spool/mail/virtualusersdomain1/info Postfix's virtual_mailbox_base = /var/spool/mail. The virtual_mailbox_domains, including that of user 'info', are a subdirectory of /var/spool/mail This is the log entry produced when user 'info' attempts to login via squirrelmail: PLAIN service=IMAP secured lip=::ffff:127.0.0.1 rip=::ffff:127.0.0.1 resp=<hidden> dovecot: Mar 12 00:32:40 Info: auth(default): passwd-file(info,::ffff:127.0.0.1): lookup: user=info file=/etc/dovecot_passdb dovecot: Mar 12 00:32:40 Info: auth(default): passwd-file(info,::ffff:127.0.0.1): unknown user dovecot: Mar 12 00:32:40 Info: auth(default): pam(info,::ffff:127.0.0.1): lookup service=dovecot dovecot: Mar 12 00:32:40 Info: auth(default): new auth connection: pid=569 dovecot: Mar 12 00:32:42 Info: auth(default): pam(info,::ffff:127.0.0.1): pam_authenticate() failed: Authentication failure dovecot: Mar 12 00:32:42 Info: imap-login: Aborted login: user=<info>, method=PLAIN, rip=::ffff:127.0.0.1, lip=::ffff:127.0.0.1, secured dovecot: Mar 12 00:32:42 Info: auth(default): client out: FAIL 1 user=info So, /etc/dovecot_passdb has ownership root:root, permissions 644 and only the contents: info:{PLAIN}Myplaintextpassword I have tried logging in both as info and also as info@virtualusersdomain1 dovecot -n shows: # 1.0.7: /etc/dovecot.conf log_path: /var/log/dovecot.log login_dir: /var/run/dovecot/login login_executable(default): /usr/libexec/dovecot/imap-login login_executable(imap): /usr/libexec/dovecot/imap-login login_executable(pop3): /usr/libexec/dovecot/pop3-login login_processes_count: 2 mail_executable(default): /usr/libexec/dovecot/imap mail_executable(imap): /usr/libexec/dovecot/imap mail_executable(pop3): /usr/libexec/dovecot/pop3 mail_plugin_dir(default): /usr/lib/dovecot/imap mail_plugin_dir(imap): /usr/lib/dovecot/imap mail_plugin_dir(pop3): /usr/lib/dovecot/pop3 auth default: verbose: yes debug: yes passdb: driver: passwd-file args: /etc/dovecot_passdb passdb: driver: pam userdb: driver: passwd-file args: home=/var/spool/mail/%d/%n mail=mbox:~/mail /etc/dovecot_passdb userdb: driver: passwd args: /etc/passwd This is all that was in orginally in /etc/dovecot.conf: protocols = imap imaps pop3 pop3s disable_plaintext_auth = no protocol imap { } protocol pop3 { } protocol lda { } auth default { mechanisms = plain } passdb pam { } userdb passwd { } user = root dict { } Dovecot runs as root. Anyway, any advice would be great! Thanks

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[Dovecot] doveadm password check
by Thomas Pries 11 Mar '13

11 Mar '13

Hi, I want to write some php code that users can change there dovecot password via a roundcube plugin. I'm using php function crypt(...) to generate the hashes and everything works well so far. I'm using doveadm pw to generate testhashes e.g.: srv:~ # doveadm pw -r 5 -s BLF-CRYPT -p abc {BLF-CRYPT}$2a$05$W82/Vw4ZEcHBC00M8cNwe.g8fOHuAeV7L5Q/q4W6VWl9V5kjoiz8y I expected an "ok" when using -t the hash when entering abc as a password, but I got: srv:~ # doveadm pw -r 5 -s BLF-CRYPT -t \{BLF-CRYPT}$2a$05$W82/Vw4ZEcHBC00M8cNwe.g8fOHuAeV7L5Q/q4W6VWl9V5kjoiz8y Enter password to verify: doveadm(root): Fatal: reverse password verification check failed: Password mismatch What went wrong? Kind Regards Thomas

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[Dovecot] Random questions on backing up Dovecot
by Tabbed Out 11 Mar '13

11 Mar '13

Hi, I've read a few threads about the subject, but I am hoping someone can comment on a few misunderstandings that I might have? It seems like doing a tar of the mail folder location then rsyncing it over to the backup location is the general idea. I plan to have dovecot create 6 virtual users using Maildir, located at /var/mail. A few specifics I am unclear on: 1) Someone here gave a descriptive outline on this here: http://www.dovecot.org/list/dovecot/2011-August/060368.html It's a bit silly, but does anyone have any comments about his suggestion on doing a 'tar cvf' first, then doing a gzip on that archive? Are the benefits really that great? 2) My lack of understanding of control files and index files contribute to this question. If I want to move to a new server and I only tar'd my /var/mail, how does this affect control files? Is it as simple as just copying pasting back into /var/mail on the new server, and then Dovecot will create new UUIDs for the messages? 3) How do I handle the case where the script is currently tarring/gzipping the entire /var/mail, but I receive a new mail during that period? What happens if I use thunderbird to delete a mail during the archiving process?

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