Monday, February 13, 2012

Dovecot v2.2 plans

(Mailing list thread for this post.)

Here's a list of things I've been thinking about implementing for Dovecot v2.2. Probably not all of them will make it, but I'm at least interested in working on these if I have time.

Previously I've mostly been working on things that different companies were paying me to work on. This is the first time I have my own company, but the prioritization still works pretty much the same way:

  • 1. priority: If your company is highly interested in getting something implemented, we can do it as a project via my company. This guarantees that you'll get the feature implemented in a way that integrates well into your system.
  • 2. priority: Companies who have bought Dovecot support contract can let me know what they're interested in getting implemented. It's not a guarantee that it gets implemented, but it does affect my priorities. :)
  • 3. priority: Things other people want to get implemented.
There are also a lot of other things I have to spend my time on, which are before the 2. priority above. I guess we'll see how things work out.

dsync-based replication

I'll write a separate post about this later. Besides, it's coming for Dovecot v2.1 so it's a bit off topic, but I thought I'd mention it anyway.

Shared mailbox improvements

Support for private flags for all mailbox formats:
namespace {
type = public
prefix = Public/
mail_location = mdbox:/var/vmail/public:PVTINDEX=~/mdbox/indexes-public
  • dsync needs to be able to replicate the private flags as well as shared flags.
  • might as well add a common way for all mailbox formats to specify which flags are shared and which aren't. $controldir/dovecot-flags would say which is the default (private or shared) and what flags/keywords are the opposite.
  • easy way to configure shared mailboxes to be accessed via imapc backend, which would allow easy shared mailbox accesses across servers or simply between two system users in same server. (this may be tricky to dsync.)
  • global ACLs read from a single file supporting wildcards, instead of multiple different files
  • default ACLs for each namespace/storage root (maybe implemented using the above..)

Metadata / annotations

Add support for server, mailbox and mail annotations. These need to be dsyncable, so their changes need to be stored in various .log files:
  1. Per-server metadata. This is similar to subscriptions: Add changes to dovecot.mailbox.log file, with each entry name a hash of the metadata key that was changed.
  2. Per-mailbox metadata. Changes to this belong inside mailbox_transaction_context, which write the changes to mailbox's dovecot.index.log files. Each log record contains a list of changed annotation keys. This gives each change a modseq, and also allows easily finding out what changes other clients have done, so if a client has done ENABLE METADATA Dovecot can easily push metadata changes to client by only reading the dovecot.index.log file.
  3. Per-mail metadata. This is pretty much equivalent to per-mailbox metadata, except changes are associated to specific message UIDs.
The permanent storage is in dict. The dict keys have components:

  • priv/ vs. shared/ for specifying private vs. shared metadata
  • server/ vs mailbox/[mailbox guid]/ vs. mail/[mailbox guid]/[uid]
  • the metadata key name
This would be a good time to improve the dict configuration to allow things like:
  • mixed backends for different hierarchies (e.g. priv/mailbox/* goes to a file, while the rest goes to sql)
  • allow sql dict to be used in more relational way, so that mail annotations could be stored with tables: mailbox (id, guid) and mail_annotation (mailbox_id, key, value), i.e. avoid duplicating the guid everywhere.
Things to think through:
  • How to handle quota? Probably needs to be different from regular mail quota. Probably some per-user "metadata quota bytes" counter/limit.
  • Dict lookups should be done asynchronously and prefetched as much as possible. For per-mail annotation lookups mail_alloc() needs to include a list of annotations that are wanted.


Copy all mail settings to namespaces, so it'll be possible to use per-namespace mailbox settings. Especially important for imapc_* settings, but can be useful for others as well. Those settings that aren't explicitly defined in the namespace will use the global defaults. (Should doveconf -a show all of these values, or simply the explicitly set values?)

Get rid of *.conf.ext files. Make everything part of dovecot.conf, so doveconf -n outputs ALL of the configuration. There are mainly 3 config files I'm thinking about: dict-sql, passdb/userdb sql, passdb/userdb ldap. The dict-sql is something I think needs a bigger redesign (mentioned above in "Metadata" section), but the sql/ldap auth configs could be merged. One way could be:

sql_db sqlmails {
# most settings from dovecot-sql.conf.ext, except for queries
driver = mysql
connect = ...

ldap_db ldapmails {
# most settings from dovecot-ldap.conf.ext, except attributes/filters

passdb {
driver = sql
db = sqlmails
sql_query = select password from users where username = '%u'
passdb {
driver = ldap
db = ldapmails
ldap_attributes {
password = %{ldap:userPassword}
ldap_filter = ...
The sql_db {} and ldap_db {} would be generic enough to be used everywhere (e.g. dict-sql), not just for passdb/userdb.

Some problems:

  • Similar to the per-namespace mail settings, doveconf -a would output all sql_query, ldap_attributes, ldap_filter, etc. settings for all passdbs/userdbs. Perhaps a similar solution?
  • The database configs contain passwords, so they should be readable only by root. This makes running dovecot-lda and maybe doveadm difficult, since they fail at "permission denied" when trying to open the config. There are probably only two solutions: a) The db configs need to be !include_try'd or b) the configs can be world-readable, but only passwords are placed to only-root-readable files by using "password = <db.password"

IMAP state saving/restoring

IMAP connections are often long running. Problems with this:
  1. Currently each connection requires a separate process (at least to work reliably), which means each connection also uses quite a lot of memory even when they aren't doing anything for a long time.
  2. Some clients don't handle lost connections very nicely. So Dovecot can't be upgraded without causing some user annoyance. Also in a cluster if you want to bring down one server, the connections have to be disconnected before they can be moved to another server.
If IMAP session state could be reliably saved and later restored to another process, both of the above problems could be avoided entirely. Typically when a connection is IDLEing there are really just 4 things that need to be remembered: username, selected mailbox name, its UIDVALIDITY and HIGHESTMODSEQ. With this information the IMAP session can be fully restored in another process without losing any state. So, what we could do is:
  1. When an IMAP connection has bee IDLEing for a while (configurable initial time, could be dynamically adjusted):
    • move the IMAP state and the connection fd to imap-idle process
    • the old imap process is destroyed
    • imap-idle process can handle lots of IMAP connections
    • imap-idle process also uses inotify/etc. to watch for changes in the specified mailbox
    • if any mailbox changes happen or IMAP client sends a command, start up a new imap process, restore the state and continue from where we left off
    • This could save quite a lot of memory at the expense of some CPU usage
  2. Dovecot proxy <-> backend protocol could be improved to support moving connection to another backend. Possibly using a separate control connection to avoid making the proxying less efficient in normal operation.
  3. When restarting Dovecot, move all the connections to a process that keeps the connections open for a while. When Dovecot starts up, create imap processes back to the connections. This allows changing configuration for existing client connections (which sometimes may be bad! need to add checks against client-visible config conflicts), upgrading Dovecot, etc. without being visible to clients. The only problem is SSL connections: OpenSSL doens't provide a way to save/restore state, so either you need to set shutdown_clients=no (and possibly keep some imap-login processes doing SSL proxying for a long time), or SSL connections need to be killed. Of course the SSL handling could be outsourced to some other software/hardware outside Dovecot.
The IMAP state saving isn't always easy. Initially it could be implemented only for the simple cases (which are a majority) and later extended to cover more.

IMAP extensions

  • CATENATE is already implemented by Stephan
  • URLAUTH is also planned to be implemented, somewhat differently than in Apple's patch. The idea is to create a separate imap-urlauth service that provides extra security.
  • NOTIFY extension could be implemented efficiently using mailbox list indexes, which already exists in v2.1.
  • FILTERS extension can be easily implemented once METADATA is implemented
  • There are also other missing extensions, but they're probably less important: BINARY & URLAUTH=BINARY, CONVERT, CONTEXT=SORT, CREATE-SPECIAL-USE, MULTISEARCH, UTF8=* and some i18n stuff.


Filesystem based backups have worked well enough with Dovecot in the past. But with new features like single instance storage it's becoming more difficult. There's no 100% consistent way to even get filesystem level backups with SIS enabled, because deleting both the message file and its attachment files can't be done atomically (although usually this isn't a real problem). Restoring SIS mails is more difficult though, first you need to restore the dbox mail files and then you need to figure out what attachment files from SIS need to be restored, and finally you'll need to do doveadm import to put them into their final destination.

I don't have much experience with backup software, but other people in my company do. The initial idea is to implement a Dovecot backup agent to one (commercial) backup software, which allows doing online backups and restoring mails one user/mailbox/mail at a time. I don't know the details yet how exactly this is going to be implemented, but the basic plan is probably to implement a "backup" mail storage backend, which is a PostgreSQL pg_dump-like flat file containing mails from all mailboxes. doveadm backup/import can then export/import this format via stdout/stdin. Incremental backups could possibly be done by giving a timestamp of previous backup run (I'm not sure about this yet).

Once I've managed to implement the first fully functional backup agent, it should become clearer how to implement it to other backup solutions.

Random things

  • dovecot.index.cache file writing is too complex, should be simplified
  • Enable auth_debug[_passwords]=yes on-the-fly for some specific users/IPs via doveadm
  • Optimize virtual mailboxes using mailbox list indexes. It wouldn't anymore need to keep all the backend mailboxes' index files open.
  • Would be nice to go forward with supporting key-value databases as mail storage backends.


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  67. Dovecot v2.2 plans to enhance data replication capabilities, share mailbox functionality, metadata handling, configuration management, and IMAP connection handling. The plans include dsync-based replication, which is already in progress for v2.1, and shared mailbox improvements, including support for private flags and ACLs for all mailbox formats. Metadata/annotations will be introduced, with changes stored in various.log files for dsync and permanent storage in dict with structured keys. Configuration will be consolidated into dovecot.conf, and SQL dict configuration will be redesign. IMAP state saving/restoring will be implemented, addressing the challenges of long-running IMAP connections. The plans also aim to improve the Dovecot proxy <-> backend protocol and handle SSL connections during Dovecot restarts. These initiatives demonstrate Dovecot's commitment to enhancing performance, scalability, and flexibility for users and administrators. estate planning lawyer

  68. alexandria traffic lawyerTo stay updated on Dovecot's development plans, it is recommended to visit the official Dovecot website, the Dovecot GitHub repository, or other communication channels where the development team shares announcements and updates.

  69. "I'm thrilled to see the advancements planned for Dovecot v2.2! The team's dedication to enhancing functionality is commendable. Looking forward to experiencing smoother operations and improved features. Kudos to the developers for their hard work!"
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  70. Dovecot, an open-source email server, is set to release version 2.2, focusing on improving performance, security, and compatibility while adding new features. The update may include enhancements to existing features, bug fixes, and new functionality based on user feedback and industry trends. Information about upcoming releases can be found on the official Dovecot website or through development channels like mailing lists or GitHub repositories. Direct checking these sources is recommended for the most accurate and up-to-date information Abogado Delitos Sexuales de Northern Virginia.

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  72. abogado testamentarioYour expertise in Dovecot v2.2 enhancements is commendable, as it can significantly impact the project. Your customer-centric approach is crucial for business success and sustainability. Time management is essential, as not all proposed improvements will be implemented. Community engagement is crucial in open-source projects, as regular interaction and feedback can lead to more robust improvements.

  73. Dovecot v2.2 plans outline the future of the email server software, promising improvements in performance, security, and usability to meet evolving user needs. The roadmap aims to solidify Dovecot's reputation as a reliable and versatile email solution, ensuring a more streamlined and efficient email experience for users worldwide.
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  74. Former President Donald Trump's lawyers have commented on allegations of Russian assistance during the 2016 presidential campaign. During investigations into Russian interference, debates and controversies surrounding contacts between Trump's campaign and individuals with ties to Russia have been ongoing. Some individuals associated with the Trump campaign faced legal scrutiny for their interactions with Russians. As of January 2022, Dovecot version 2.2 was released, and there may have been discussions or plans for subsequent versions. Dovecot is a popular open-source IMAP and POP3 email server that typically updates with bug fixes, security enhancements, and feature improvements based on user feedback and developer contributions. For the latest information on development plans and upcoming features, check the official Dovecot website or relevant community forums Abogado Defensor DUI de Fairfax VA.

  75. The Dovecot blog shares exciting plans for version 2.2, offering a glimpse into the future of this email server software. The post highlights the commitment to improved performance, stability, and new features, demonstrating Dovecot's dedication to enhancing user experiences. The clear communication of upcoming changes fosters transparency and keeps the user community well-informed. This insightful blog post serves as a valuable resource for users and developers, creating anticipation for the advancements to come in Dovecot version 2.2. The thoughtful planning and open dialogue showcased in the post contribute to the positive and collaborative spirit surrounding Dovecot development.
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  76. The "Dovecot v2.2 plans" article provides a detailed overview of upcoming updates and developments in Dovecot email server software. It highlights the company's commitment to continuous innovation and excellence in email server technology, focusing on enhancing performance, security, and user experience. This roadmap offers a clear vision for Dovecot's future, making it an essential read for those interested in the latest email server software advancements.
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  79. Dovecot, an open-source IMAP and POP3 email server for Linux/UNIX-like systems, is known for reliability, security, and performance. It is continuously developed and updated with new versions. To stay updated on Dovecot's developments, visit their official website, subscribe to their mailing list, or follow their GitHub repository for code changes and discussions fairfax Weapons Offense Lawyer.

  80. uncontested divorce lawyer arlington va Your expertise in Dovecot v2.2 enhancements is commendable, as it can significantly impact the project. Your customer-centric approach is crucial for business success and sustainability. Time management is essential, as not all proposed improvements will be implemented.

  81. Dovecot is an open-source email server software that supports IMAP and POP3 protocols, ensuring secure communication between users and the server. It is designed for Unix-like operating systems like Linux, BSD, and macOS and offers security through TLS/SSL encryption and various authentication mechanisms. Dovecot's scalability and performance are facilitated by efficient storage formats like Maildir and dbox, and its multi-threaded architecture for high-traffic email servers drug crime attorneys fairfax va.


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  83. divorce lawyer arlington va The GitHub repository is often used for Dovecot's development, where users can find the latest code, issues, and discussions related to the plans. Dovecot also has mailing lists where developers and users discuss various topics related to the software. Release notes are typically provided with each new version, and community forums or discussion boards are where users and developers can share information about upcoming releases and features.

  84. divorce lawyer arlington va The GitHub repository is often used for Dovecot's development, where users can find the latest code, issues, and discussions related to the plans. Dovecot also has mailing lists where developers and users discuss various topics related to the software. Release notes are typically provided with each new version, and community forums or discussion boards are where users and developers can share information about upcoming releases and features.