- dovecot - dovecot.org

MD5-CRYPT/CRAM-MD5 vs SHA512-CRYPT/PLAIN
by ML mail 06 Dec '14

06 Dec '14

Hello, I am wondering which variant is more secure for user authentication and password scheme. Basically I am looking at both variants: 1) MD5-CRYPT password scheme storage with CRAM-MD5 auth mechanism 2) SHA512-CRYPT password scheme storage with PLAIN auth mechanism In my opinion the option 2) should be safer although it is using PLAIN auth mechanism. Of course I would always use STARTTLS and not allow unencrypted connection. What is your opinion? Best, ML

6 7

Size of array hosts, vhosts_count and modulo operation
by rub zorghy 05 Dec '14

05 Dec '14

Hi, Timo Sirainen wrote (May 19, 2010 1:50:34 am) : "When a connection from a newly seen user arrives, it gets assigned to a mail server according to a function: host = vhosts[ md5(username) mod vhosts_count ]" This hash function is it still used as it is without modification ? My another question sounds pretty innocent but I have doubts about vhosts_count. Taking two directors with three backend Dovecot as an example, the number of (v)hosts assigned for each host is "100" (default value of the vhost_count variable). I gather that the value for vhosts_count (to perform the modulo operation) and the size or length of the array (vhosts[]) in terms of number of elements are equal to 300. Thx so much. gdrub

1 0

doveadm backup gmail using imapc
by List 05 Dec '14

05 Dec '14

I am trying to sync a gmail inbox with dovecot 2.2.10 using the following config: imapc_host = 64.233.171.108 imapc_user = %u imapc_master_user = master imapc_password = secret imapc_features = rfc822.size imapc_features = $imapc_features fetch-headers mail_prefetch_count = 20 # If the old IMAP server uses INBOX. namespace prefix, set: #imapc_list_prefix = INBOX # for SSL: imapc_port = 993 imapc_ssl = imaps #imapc_ssl_ca_dir = /etc/ssl imapc_ssl_verify = no And the doveadm command: doveadm -D -o imapc_user=test(a)domain.tld -o imapc_password=password backup -R -x '\All' -x '\Flagged' -x '\Important' -u test(a)domain.tld imapc: I am getting the error: dsync(test(a)domain.tld: Error: Mailbox INBOX sync: mailbox_delete failed: INBOX can't be deleted. What I really want to do is just sync Gmail's inbox, drafts, sent, trash/archive, and spam folders to my new system. Is this possible using imapc?

1 0

Dovecot Director and Dovecot proxy
by rub zorghy 05 Dec '14

05 Dec '14

Hi, Dovecot Director is used to keep a temporary user -> Dovecot backend server mapping. So, Director decides which backend handles each user and the user is always redirected to the same server. All user data is stored in shared storage (NFS). The Dovecot presentation featured during this webinar <http://knowledgebase.open-xchange.com/fileadmin/user_upload/open-xchange/mi…> mentions (slide 7) a Dovecot proxy cluster (doing credentials and user info lookup) behind the LB device (F5 Big-IP) Why Dovecot Director server isn't used to perform this without Dovecot proxy ? Thus, the load balancer (F5 Big-IP) can distribute requests based on IMAP protocol to Dovecot Director cluster. Thx so much. gdrub

2 2

speed up doveadm search
by Vu Ngoc VU 05 Dec '14

05 Dec '14

Hello, I have recently migrated our mail accounts from old setup with courier-imapd to Dovecot 2. I thought that I can search quicky messages in mailboxes with doveadm because of indexes. Our users are asking (sometimes) to remove messages that they have sent wrongly. Some of them are coming from Exchange, and there is a feature in Outlook to recall (to delete) a message. So basically, they give me some infos (date, sender, subject) of message to remove. And I planned to do "doveadm search", then "doveadm fetch" and at last "doveadm expunge" on the found results. But it appears that the first run of doveadm is very slow. I don't know if it is because some indexes/caches are missing at this time. But when I run again same commands it is fast. Could you tell me if I speed up search on our maildir storage? I have no idea if I must manually (or with cron) run "doveadm index" on all our accounts because index/cache is only generated when users access their mailboxes. Or do I have to tune some settings like : mail_always_cache_fields, mail_cache_fields, mail_cache_min_mail_count, mail_never_cache_fields Thanks

1 0

does lda_save_to_detail_mailbox exist?
by A. Schulze 04 Dec '14

04 Dec '14

Hello, there is a nice feature in lmtp to save messages to user+foo@domain in INBOX/foo Looks like that doesn't work as good if lda is used. I have dovecot-2.2.13 mail_location = maildir:%h/ lda_mailbox_autocreate = yes lda_mailbox_autosubscribe = yes *lmtp*_save_to_detail_mailbox = yes messages to user+foo generate an error and are saved to INBOX not matter if INBOX/foo exist or not: Dec 4 09:40:59 mail dovecot: lda(user(a)example.org): Debug: Effective uid=10020, gid=10020, home=/var/mail/user(a)example.org/ Dec 4 09:40:59 mail dovecot: lda(user(a)example.org): Debug: Destination address: user(a)example.org (source: user@hostname) Dec 4 09:40:59 mail dovecot: lda(user(a)example.org): msgid=<3jtWlm3FCHz52KG@localhost>: save failed to open mailbox foo: Mailbox can't be created Dec 4 09:40:59 mail dovecot: lda(user(a)example.org): msgid=<3jtWlm3FCHz52KG@localhost>: saved mail to INBOX # doveadm user -u user(a)example.org userdb: user(a)example.org home : /var/mail/user(a)example.org/ quota_rule: *:bytes=1000000 master_user: user(a)example.org # doveadm mailbox list -u user(a)example.org INBOX INBOX/bar Possible, that *lda*_save_to_detail_mailbox is simply not implemented? Thanks, Andreas

2 2

"maildir_empty_new = yes" not working
by Nikola Derikonjic 04 Dec '14

04 Dec '14

I need for my dovecot-uidlist to be updated with next id when new email arrives (moved from new/ to cur/). This only happens now when I check for new email with my client. Setting maildir_empty_new = yes is not working. Do I have to uncomment something else as well maybe? I want to do some proemial pipe lets say for 10 emails. All of them will have same UID since dovecot-uidlist is not updated. I am suing 2.2.13 dovecot on Gentoo 64bit. This is my dovecot -n: # 2.2.13: /etc/dovecot/dovecot.conf # OS: Linux 3.16.5-gentoo x86_64 Gentoo Base System release 2.2 auth_mechanisms = plain login digest-md5 first_valid_gid = 500 last_valid_gid = 2000 last_valid_uid = 2000 login_greeting = Santa server is ready. mail_gid = vmail mail_location = /var/vmail/%d/%n/:INDEX=/var/vmail/%d/%n/indexes mail_uid = vmail maildir_empty_new = yes managesieve_notify_capability = mailto managesieve_sieve_capability = fileinto reject envelope encoded-character vacation subaddress comparator-i;ascii-numeric relational regex imap4flags copy include variables body enotify environment mailbox date ihave duplicate namespace inbox { inbox = yes location = mailbox Drafts { special_use = \Drafts } mailbox Junk { special_use = \Junk } mailbox Sent { special_use = \Sent } mailbox "Sent Messages" { special_use = \Sent } mailbox Trash { special_use = \Trash } prefix = } passdb { args = /etc/dovecot/dovecot-sql.conf.ext driver = sql } plugin { sieve = ~/.dovecot.sieve sieve_dir = ~/sieve } service auth-worker { user = vmail } service auth { unix_listener /var/spool/postfix/private/auth { group = postfix mode = 0666 user = postfix } unix_listener auth-userdb { group = vmail mode = 0666 user = vmail } } service lmtp { unix_listener /var/spool/postfix/private/dovecot-lmtp { group = postfix mode = 0666 user = postfix } } ssl_ca = </etc/ssl/dovecot/server.in.crt ssl_cert = </etc/ssl/dovecot/server.csr.rapid ssl_key = </etc/ssl/dovecot/server.key.rapid ssl_key_password = notshown userdb { args = /etc/dovecot/dovecot-sql.conf.ext driver = sql } -- Nikola Derikonjic Sent with Sparrow (http://www.sparrowmailapp.com/?sig)

2 2

Manual (file system level) message deletion
by absolutely_free＠libero.it 04 Dec '14

04 Dec '14

Hi,I use Dovecot + Postfix on CentOS server. I use maildir. What happen if I manually delete some messages (eg. the ones older than 6 months) for every use?I think that dovecot's indexes will be wrong... is this a potential performance issue?If so, how can I "rebuild" index file for every user? Thank you

2 1

R: Re: R: Re: best file system ?
by absolutely_free＠libero.it 04 Dec '14

04 Dec '14

Thank you very much for your detailed explaination! >----Messaggio originale---- >Da: amateo(a)um.es >Data: 03/12/2014 8.13 >A: <dovecot(a)dovecot.org> >Ogg: Re: R: Re: best file system ? > >El 02/12/14 a las 16:38, absolutely_free(a)libero.it escribió: >> Hi Angel, >> can you please share your dovecot configuration? > > I have attached our doveconf -n output. We have two imap servers (with >the same configuration) and two more acting as proxy (with director) in >front of them. These last direct user request to their corresponding server. > > For storage we are using our SAN (a HP 3PAR 7400) connecting to it with >fibre channel. We have two XFS filesystems. One for mail indexes and the >other for user mailboxes and attachment files. > > In these servers we are running ubuntu 12.04 with kernel 3.4.0. > >> What webmail are you using (if any)? > > We are using horde. > >-- >Angel L. Mateo Martínez >Sección de Telemática >Área de Tecnologías de la Información >y las Comunicaciones Aplicadas (ATICA) >http://www.um.es/atica >Tfo: 868887590 >Fax: 868888337 >

1 0

incorrect column width for multi-byte characters by'doveadm -f table'
by Hardy Flor 03 Dec '14

03 Dec '14

In calculating the column width multi-byte characters (eg umlauts, utf8) not properly analyzed: Username mailbox messages guid sh_berger Spam 0 a7b32818c14e5b54bf5500006ad9a53c sh_berger Entwürfe 0 a4b32818c14e5b54bf5500006ad9a53c sh_berger Papierkorb 0 a6b32818c14e5b54bf5500006ad9a53c

1 0