- dovecot - dovecot.org

[Dovecot] Passing data safely in password_key?
by Attila Nagy 05 Aug '13

05 Aug '13

Hi, I would like to convert my custom POP/IMAP proxy to Dovecot's. In this proxy I do more than giving back user name, password and the host and I need extra information. Luckily all of them are available as variables, but more than one comes as user input (like user name and cleartext password) and I'm not sure how to pass them safely. Obviously I would need a separator, which is guaranteed not to show up either in user name and the cleartext password. Should I use escape (%E) here, or is there a better way?

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[Dovecot] ACL not copied to new mailboxes
by Markus Weippert 05 Aug '13

05 Aug '13

Hi, I had some trouble with ACLs not being copied to new child mailboxes in dovecot 2.2.4. It doesn't matter whether it's a private, shared or public mailbox I create the folder in, the ACLs just seems to be ignored. Anyway, I debugged the executable and came up with the attached patch. Since I'm not a developer, I'm not 100% sure about this but it works for me now. Regards, Markus # dovecot --build-options Build options: ioloop=epoll notify=inotify ipv6 openssl io_block_size=8192 Mail storages: shared mdbox sdbox maildir mbox cydir imapc pop3c raw fail SQL drivers: mysql Passdb: checkpassword ldap pam passwd passwd-file shadow sql Userdb: checkpassword ldap nss passwd prefetch passwd-file sql # doveconf -n # 2.2.4: /usr/local/etc/dovecot/dovecot.conf # OS: Linux 3.2.0-48-generic x86_64 Ubuntu 12.04.2 LTS auth_cache_negative_ttl = 5 mins auth_cache_size = 10 M auth_cache_ttl = 1 mins auth_debug = yes auth_master_user_separator = * auth_mechanisms = plain login auth_verbose = yes first_valid_gid = 122 first_valid_uid = 114 imap_client_workarounds = tb-extra-mailbox-sep tb-lsub-flags last_valid_gid = 122 last_valid_uid = 114 mail_debug = yes mail_gid = vmail mail_plugins = acl mail_privileged_group = vmail mail_uid = vmail 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 namespace { alias_for = hidden = yes inbox = no list = no location = prefix = INBOX. separator = . type = private } namespace { list = children location = maildir:/var/vmail/public/%d:LAYOUT=fs prefix = Public/ separator = / subscriptions = no type = public } namespace { list = children location = maildir:/var/vmail/mail/%%d/%%n:INDEX=~/shared/%%d/%%n prefix = Shared/%%u/ separator = / subscriptions = no type = shared } namespace inbox { inbox = yes location = mailbox Drafts { auto = subscribe special_use = \Drafts } mailbox Junk { auto = subscribe special_use = \Junk } mailbox Sent { auto = subscribe special_use = \Sent } mailbox Trash { auto = subscribe special_use = \Trash } prefix = separator = / type = private } passdb { args = /etc/dovecot/auth/%s.master driver = passwd-file master = yes pass = yes } passdb { args = /etc/dovecot/dovecot-sql.conf.ext driver = sql } plugin { acl = vfile:/var/vmail/acls:cache_secs=300 acl_shared_dict = file:/var/vmail/mail/shared-mailboxes.db sieve = ~/dovecot.sieve sieve_after = /var/vmail/sieve/after sieve_before = /var/vmail/sieve/before sieve_default = /var/vmail/sieve/default.sieve sieve_dir = ~/sieve sieve_global_dir = /var/vmail/sieve/global } protocols = imap lmtp sieve service auth { unix_listener /var/spool/postfix/private/dovecot-auth { group = postfix mode = 0660 user = postfix } unix_listener auth-userdb { mode = 0777 } } service imap-login { process_min_avail = 10 service_count = 0 } service lmtp { unix_listener /var/spool/postfix/private/dovecot-lmtp { group = postfix mode = 0660 user = postfix } } ssl_cert = </etc/ssl/dovecot.pem ssl_cipher_list = HIGH:!MD5:!eNULL ssl_key = </etc/ssl/dovecot.pem userdb { args = /etc/dovecot/dovecot-sql.conf.ext driver = sql } protocol lmtp { mail_plugins = acl sieve } protocol lda { mail_plugins = acl sieve } protocol imap { mail_plugins = acl imap_acl }

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[Dovecot] Maildir Synchronization warnings
by Kavish Karkera 05 Aug '13

05 Aug '13

Hi, We are repeatedly getting these below warnings for some of our users, al though we have no complaints from them yet, we need to know why these warning occurs. So it would be help full if some one explain these warning msg in detail. ----------------------------------------------------------------------------------------------------------------------------------------------------- Aug 2 12:52:55 blade8 dovecot: imap(kavish.karkera(a)example.com): Warning: Maildir: Scanning /mail/v3store/example.com/kavish.karkera(a)example.com/Maildir/cur took 94 seconds (23191 readdir()s, 0 rename()s to cur/, why=0x1) Aug 2 12:52:55 blade8 dovecot: imap(kavish.karkera(a)example.com): Warning: Maildir /mail/v3store/example.com/kavish.karkera(a)example.com/Maildir: Synchronization took 94 seconds (0 new msgs, 0 flag change attempts, 0 expunge attempts) Aug 2 12:53:54 blade6 dovecot: imap(kavish.karkera(a)example.com): Warning: Maildir: Scanning /mail/v3store/example.com/kavish.karkera(a)example.com/Maildir/cur took 154 seconds (43129 readdir()s, 0 rename()s to cur/, why=0x1) Aug 2 12:53:54 blade6 dovecot: imap(kavish.karkera(a)example.com): Warning: Maildir: Scanning /mail/v3store/example.com/kavish.karkera(a)example.com/Maildir/cur took 162 seconds (43129 readdir()s, 0 rename()s to cur/, why=0xc) Aug 2 12:53:54 blade6 dovecot: imap(kavish.karkera(a)example.com): Warning: Maildir /mail/v3store/example.com/kavish.karkera(a)example.com/Maildir: Synchronization took 162 seconds (0 new msgs, 0 flag change attempts, 0 expunge attempts) Aug 2 12:53:54 blade6 dovecot: imap(kavish.karkera(a)example.com): Warning: Locking transaction log file /indexes//mail/v3store/example.com/kavish.karkera(a)example.com/.INBOX/dovecot.index.log took 50 seconds ----------------------------------------------------------------------------------------------------------------------------------------------------- Thanks In advance, Regards, Kavish Karkera

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[Dovecot] [Metadata Plugin] Q: Source Repository
by Christoph Hintermüller 05 Aug '13

05 Aug '13

Hi I'm currently trying to package V14 of Metadata plugin for Ubuntu Quantal (https://launchpad.net/~privatedata/+archive/dovecot-2.2.2/) to be installed along with dovecot 2.2.4. According to my efforts packaging the plugin i do have some questions For future releases, is it possible to add a link to the current release on the meta data mercurial page which includes in the filename of the tar.gz archive the current version number of the plugin ( metadata-plugin-v14.tar.gz). That would allow to add an appropriate line in the debian/watch file to detect when a new release of the plugin is available. Currently i have to check mercurial page manually and use an updated version mangling entry to ensure that the packaging system downloads the latest version. The link would help to simplify this. Especially as the base link in my debian/watch file currently points to tip.tar.gz and not to the archive the linke of the V14 tag points to. The sources i got represent the tip.tar.gz downloaded on July 19th 2013 23:16 CET which likely do not exactly correspond to the contents of the archive containing sources of V14. Therefore a versioned link to the source archives of the latest version would simplify things a lot, especially adding patches released for the latest version. As well as reporting the following addition. Further I have added a doc directory stub, containing the configuration examples found in thread http://dovecot.2317879.n4.nabble.com/dovecot-metadata-8-released-tp10091.ht… Greetings Christoph

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[Dovecot] Subfolders of Inbox with LAYOUT=fs
by Keith Edmunds 05 Aug '13

05 Aug '13

We've just converted to LAYOUT=fs. Some users had subfolders under Inbox, and for those users some MUAs no longer show those folders. The directory structure is that the cur, tmp and new folders are in the 'location' directory, but the subfolders are in $location/INBOX/$foldername. I am suspicious of this: 12 list "" INBOX * LIST (\HasNoChildren) "/" "INBOX" 12 OK List completed. I have tried moving the cur, tmp and new folders to $location/INBOX, and changing 'location' in dovecot.conf, but the subfolders still do not show. Question: is it legitimate to have subfolders of INBOX when using LAYOUT=fs? If so, what am I missing? Thanks, Keith Config: # dovecot -n # 2.1.7: /etc/dovecot/dovecot.conf # OS: Linux 3.2.0-4-amd64 x86_64 Debian 7.1 ext3 lda_mailbox_autocreate = yes log_timestamp = "%Y-%m-%d %H:%M:%S " mail_home = /home/%u mail_location = maildir:/home/imapmail/%u:LAYOUT=fs mail_privileged_group = mail 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 namespace { inbox = yes location = maildir:/home/imapmail/%u:LAYOUT=fs prefix = separator = / type = private } namespace { hidden = no list = children location = maildir:/home/imapmail/public:INDEX=/home/imapmail/public.indexes/%u.index:LAYOUT=fs prefix = public/ separator = / subscriptions = no type = public } passdb { driver = pam } plugin { acl = vfile acl_shared_dict = file:/home/imapmail/shared-mailboxes fts = squat home = /home/%u sieve = /home/sieve/%u.sieve sieve_dir = /home/sieve/%u } protocols = imap sieve service auth { user = root } service managesieve-login { inet_listener sieve { port = 4190 } } ssl_cert = </etc/dovecot/TCL_IMAPS_server.crt ssl_key = </etc/dovecot/TCL_IMAPS_server.key userdb { args = uid=imapmail gid=imapmail driver = static } protocol imap { imap_client_workarounds = tb-extra-mailbox-sep mail_plugins = acl imap_acl fts fts_squat } protocol pop3 { pop3_uidl_format = %08Xu%08Xv } protocol lda { mail_plugins = sieve } -- "You can't live a perfect day without doing something for someone who will never be able to repay you."

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[Dovecot] Help needed with SOLR integration
by Nigel Smith 05 Aug '13

05 Aug '13

Hi, Is there anything wrong with this config for getting SOLR working ? I'm on Ubuntu 12.04LTS and using the bundled Jetty and SOLR. Calling "http://localhost:8080/solr/update?optimize=true" doesn't return an error. And I'm pretty sure I've replaced the schema ? Help & thanks in advance Nigel # 2.0.19: /etc/dovecot/dovecot.conf # OS: Linux 3.5.0-37-generic x86_64 Ubuntu 12.04.2 LTS mail_location = maildir:~/Maildir 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 passdb { args = scheme=CRYPT username_format=%u /etc/dovecot/users driver = passwd-file } plugin { fts = solr fts_solr = url=http://localhost:8080/solr/ sieve = ~/.dovecot.sieve sieve_dir = ~/sieve } protocols = imap lmtp sieve service auth { unix_listener /var/spool/postfix/private/dovecot-auth { group = postfix mode = 0660 user = postfix } unix_listener auth-userdb { group = its-virtmail user = its-virtmail } } service imap-login { process_min_avail = 3 } service lmtp { process_min_avail = 5 unix_listener /var/spool/postfix/private/dovecot-lmtp { group = postfix mode = 0600 user = postfix } user = its-virtmail } service managesieve-login { inet_listener sieve { port = 4190 } process_min_avail = 3 } ssl = required ssl_cert = </etc/ssl/certs/mx_example_com.pem ssl_cipher_list = TLSv1+HIGH:!SSLv2:!aNULL:!eNULL:!3DES:!PSK:@STRENGTH ssl_key = </etc/ssl/private/mx_example_com.key userdb { args = username_format=%u /etc/dovecot/users driver = passwd-file } protocol imap { imap_client_workarounds = delay-newmail mail_max_userip_connections = 10 mail_plugins = fts fts_solr } protocol pop3 { mail_max_userip_connections = 10 pop3_client_workarounds = outlook-no-nuls oe-ns-eoh } protocol lda { deliver_log_format = msgid=%m: %$ mail_plugins = sieve postmaster_address = postmaster quota_full_tempfail = yes rejection_reason = Your message to <%t> was automatically rejected:%n%r } protocol lmtp { mail_plugins = sieve postmaster_address = bp(a)example.com }

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[Dovecot] Weird log entries when some users are composing messages in Thunderbird
by Charles Marcus 05 Aug '13

05 Aug '13

Hi all/Timo, When some of our users are composing a message in Thunderbird, I see a ton of these in the logs, and they keep repeating the entire time they are typing until the message gets sent... > 2013-08-05T10:34:42-04:00 myhost dovecot: imap-login: Login: user=<user(a)media-brokers.com>, method=PLAIN, rip=###.###.###.###, lport=993, mpid=8152, TLS, session=<El2GNTTjNgDAqAIc> > 2013-08-05T10:34:42-04:00 myhost dovecot: imap(user(a)media-brokers.com): Disconnected: Disconnected in IDLE in=149 out=12449 > 2013-08-05T10:34:42-04:00 myhost dovecot: imap-login: Login: user=<user(a)media-brokers.com>, method=PLAIN, rip=###.###.###.###, lport=993, mpid=8153, TLS, session=<lJedNTTjNwDAqAIc> > 2013-08-05T10:34:42-04:00 myhost dovecot: imap(user(a)media-brokers.com): Disconnected: Disconnected in IDLE in=149 out=12449 I confirmed that their 'Auto-Save' settings are the defaults (5 minutes, same as mine), and when I'm composing a message, there are no entries like this. The only other option I could think of that might affect t his is the 'spell check as you type', which is also enabled on mine. Also - I'm not sure this *always* happens to these users... all I know is, I see these flooding the logs sometimes, and when I remote in, that user is composing a message. Anyone have any idea why this happens to only a few of our users, and possibly only sometimes? Could it be something in the HTML of the quoted text when they are replying to certain messages? Thanks, -- Best regards, Charles

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Re: [Dovecot] problems with doveadm
by listserv 05 Aug '13

05 Aug '13

> > On 3.8.2013, at 14.25, listserv <listserv(a)xtlv.cn> wrote: > >> doveadm expunge -A mailbox Trash savedbefore 7d >> => kernel: doveadm[11609]: segfault at 10 ip b75f146a sp bf856ad0 error 4 in >> libdovecot.so.0.0.0[b7585000+c8000] > > gdb backtrace would be useful, for example: > > gdb --args doveadm expunge -A mailbox Trash savedbefore 7d > run > bt full > Thank you for your advice. Here the backtrace: gdb --args doveadm expunge -A mailbox Trash savedbefore 7d GNU gdb (GDB) 7.6 (Debian 7.6-5) Copyright (C) 2013 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html> This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. Type "show copying" and "show warranty" for details. This GDB was configured as "i486-linux-gnu". For bug reporting instructions, please see: <http://www.gnu.org/software/gdb/bugs/>... Reading symbols from /usr/bin/doveadm...Reading symbols from /usr/lib/debug/usr/bin/doveadm...done. done. (gdb) run Starting program: /usr/bin/doveadm expunge -A mailbox Trash savedbefore 7d warning: Could not load shared library symbols for linux-gate.so.1. Do you need "set solib-search-path" or "set sysroot"? [Thread debugging using libthread_db enabled] Using host libthread_db library "/lib/i386-linux-gnu/i686/cmov/libthread_db.so.1". Program received signal SIGSEGV, Segmentation fault. i_stream_next_line (stream=0x0) at istream.c:382 382 istream.c: Datei oder Verzeichnis nicht gefunden. (gdb) bt full #0 i_stream_next_line (stream=0x0) at istream.c:382 _stream = <optimized out> pos = <optimized out> #1 0xb7dfbd01 in auth_master_user_list_next (ctx=0x80bf668) at auth-master.c:694 line = <optimized out> #2 0xb7ef72cb in mail_storage_service_all_next (ctx=0x80b8f60, username_r=0xbffff550) at mail-storage-service.c:1294 __FUNCTION__ = "mail_storage_service_all_next" #3 0x08057db5 in doveadm_mail_all_users (wildcard_user=0x0, argv=<optimized out>, ctx=0x80b53f0) at doveadm-mail.c:368 ret = <optimized out> input = {module = 0x0, service = 0x8092f63 "doveadm", username = 0x80bf070 "admin(a)xtlv.jp", session_id = 0x0, local_ip = {family = 0, u = {ip6 = {__in6_u = {__u6_addr8 = '\000' <repeats 15 times>, __u6_addr16 = {0, 0, 0, 0, 0, 0, 0, 0}, __u6_addr32 = {0, 0, 0, 0}}}, ip4 = {s_addr = 0}}}, remote_ip = {family = 0, u = {ip6 = {__in6_u = {__u6_addr8 = '\000' <repeats 15 times>, __u6_addr16 = {0, 0, 0, 0, 0, 0, 0, 0}, __u6_addr32 = {0, 0, 0, 0}}}, ip4 = {s_addr = 0}}}, local_port = 0, remote_port = 0, userdb_fields = 0x0, flags_override_add = (unknown: 0), flags_override_remove = (unknown: 0), no_userdb_lookup = 0} user_idx = 0 user = 0x80bf070 "admin(a)xtlv.jp" error = 0xb7e6f2f0 "" #4 doveadm_mail_cmd (argv=<optimized out>, argc=<optimized out>, cmd=0xbffff5ac) at doveadm-mail.c:523 ctx = 0x80b53f0 getopt_args = <optimized out> ret = <optimized out> c = <optimized out> wildcard_user = 0x0 error = <optimized out> #5 doveadm_mail_try_run (cmd_name=cmd_name@entry=0x80b1209 "expunge", argc=argc@entry=6, argv=argv@entry=0x80b11dc) at doveadm-mail.c:608 cmd = 0xbffff5ac #6 0x08056b26 in main (argc=6, argv=0x80b11dc) at doveadm.c:398 cmd_name = <optimized out> i = <optimized out> quick_init = false c = <optimized out> -- 中華人民共和國

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[Dovecot] dovecot fts solr plugin
by Thomas Baumann 05 Aug '13

05 Aug '13

Hello list, * apache-solr-3.6.2 * dovecot-2.1.7 I configured fts_solr for dovecot, but I have two issues When doing a search request within telnet 127.0.0.1 143 it connects to solr. Jul 21, 2013 4:38:15 PM org.apache.solr.core.SolrCore execute INFO: [] webapp=/solr path=/select params={rows=1&q=box:10361d30f8c4ea51ad7c00002ecaff3b+user:" tom(a)tirism.support.tiri.li"&sort=uid+desc&fl=uid} hits=0 status=0 QTime=10 Jul 21, 2013 4:38:15 PM org.apache.solr.core.SolrCore execute INFO: [] webapp=/solr path=/select params={rows=3&q=(hdr:"test"+OR+body:"test")&fq=%2Bbox:10361d30f8c4ea51ad7c00002ecaff3b+%2Buser:" tom(a)tirism.support.tiri.li"&sort=uid+asc&fl=uid,score} hits=0 status=0 QTime=7 But (1) doveadm fts fails: $ doveadm fts rescan -u tom(a)domain.com Error message: doveadm(tom(a)tirism.support.tiri.li): Error: fts not enabled for user's namespace (null) (2) solr schema has errors Jul 21, 2013 4:35:46 PM org.apache.solr.common.SolrException log SEVERE: org.apache.solr.common.SolrException: undefined field text at org.apache.solr.schema.IndexSchema.getDynamicFieldType(IndexSchema.java:1330) at org.apache.solr.schema.IndexSchema$SolrQueryAnalyzer.getAnalyzer(IndexSchema.java:408) at org.apache.solr.schema.IndexSchema$SolrIndexAnalyzer.reusableTokenStream(IndexSchema.java:383) at org.apache.lucene.queryParser.QueryParser.getFieldQuery(QueryParser.java:574) at org.apache.solr.search.SolrQueryParser.getFieldQuery(SolrQueryParser.java:206) at org.apache.lucene.queryParser.QueryParser.Term(QueryParser.java:1436) at org.apache.lucene.queryParser.QueryParser.Clause(QueryParser.java:1319) at org.apache.lucene.queryParser.QueryParser.Query(QueryParser.java:1245) at org.apache.lucene.queryParser.QueryParser.TopLevelQuery(QueryParser.java:1234) at org.apache.lucene.queryParser.QueryParser.parse(QueryParser.java:206) at org.apache.solr.search.LuceneQParser.parse(LuceneQParserPlugin.java:79) at org.apache.solr.search.QParser.getQuery(QParser.java:143) at org.apache.solr.handler.component.QueryComponent.prepare(QueryComponent.java:105) at org.apache.solr.handler.component.SearchHandler.handleRequestBody(SearchHandler.java:165) at org.apache.solr.handler.RequestHandlerBase.handleRequest(RequestHandlerBase.java:129) at org.apache.solr.core.SolrCore.execute(SolrCore.java:1376) at org.apache.solr.core.QuerySenderListener.newSearcher(QuerySenderListener.java:59) at org.apache.solr.core.SolrCore$3.call(SolrCore.java:1182) at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:314) at java.util.concurrent.FutureTask.run(FutureTask.java:149) at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:897) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:919) at java.lang.Thread.run(Thread.java:736) Hope somebody can help! Best regards, Thomas # dovecot --version 2.1.7 # dovecot -n # 2.1.7: /etc/dovecot/dovecot.conf # OS: Linux 3.0.74-0.6.10-default x86_64 SUSE Linux Enterprise Server 11 (x86_64) xfs base_dir = /var/run/dovecot/ dict { expire = sqlite:/etc/dovecot/dovecot-dict-sql.conf.ext quota = mysql:/etc/dovecot/dovecot-dict-sql.conf.ext } first_valid_uid = 5000 listen = * login_greeting = tiri Mail ready. login_trusted_networks = 127.0.0.1 mail_location = maildir:/var/vmail/%u/ mail_plugins = fts fts_solr 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 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 { driver = pam } passdb { args = /etc/dovecot/dovecot-sql.conf.ext driver = sql } plugin { sieve = ~/.dovecot.sieve sieve_dir = ~/sieve } ssl = no userdb { driver = passwd } userdb { args = /etc/dovecot/dovecot-sql.conf.ext driver = sql } protocol imap { plugin { fts = solr fts_solr = break-imap-search url=http://localhost:8983/solr/ } } protocol pop3 { plugin { fts = solr fts_solr = break-imap-search url=http://localhost:8983/solr/ } }

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[Dovecot] Design: Adding checksums to index files
by Timo Sirainen 05 Aug '13

05 Aug '13

I've been planning on adding these for years. Maybe it's about time soon. I guess they could be added already to v2.2, but enabled only by a new setting because it requires file format changes that old Dovecots can't then read. I could probably patch v2.1 also so it is able to at least read the new format without failing. For v2.3 this new format could then be made the default. And what would the checksums be exactly? Would the standard CRC32 and CRC8 work fine, or are there any better ones? 1. dovecot.index v2.1+ always only fully recreates this file, never overwrites data to it. So the checksums could be written only when the dovecot.index is being recreated. There are 3 possible things to checksum: - header (32bit checksum) - all of the mail records (32bit checksum) - each mail record independently (8bit checksum per mail) The header's checksum could be verified every time the index is opened. The full mail record checksum could be verified when something appears to be wrong, but it's probably a waste of time to check it in normal operation. I'm not really sure about the per-mail checksums. It would be easy to create them while dovecot.index is being created, but after reading the file into memory the records are updated in many ways in many places. It's probably not worth the complexity and extra slowness to verify and/or update the checksums in all the different places. So is it worth it to even have them? In error conditions when fixing up indexes it could be useful to skip over records with broken checksums (and check if the mail is in dovecot.index.backup with correct checksum). Maybe that's enough to be worth 1 byte per message?.. 2. dovecot.index.log This file is only appended to. Each committed transaction could be prefixed in the new format with <transaction size><transaction 32bit checksum>. With the new format this wouldn't actually increase the log file size much, because there is already some space wasted for a compatibility "boundary" record that could be removed now. 3. dovecot.index.cache Cache file is the most complex file. Its headers get overwritten once in a while. Probably not worth the trouble to checksum the header itself, and there's not a lot that could be done even if a broken checksum was found. But each mail_cache_record could have its own checksum. A 8bit checksum could be added without increasing the file's size. Maybe that would be enough? 4. dovecot.index.thread This is a rather simple file and a 32bit checksum could be added to its header, and verified every time the file is read (because it's fully read anyway). 5. dovecot.mailbox.log This file doesn't even have a header. There are 3 unused bytes in each record currently. One of them could be used for a new "flags" parameter, with the only flag being "checksum added". There would still be space left for 8bit or 16bit checksum. 6. Other files There are also some text files, like dovecot-acl, subscriptions, quota usage and Sieve scripts. They probably have to be without checksums for now.

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