December 2022 - dovecot

Self hosting solution for Christmas
by Andre Rodier 29 Dec '22

29 Dec '22

Hello everyone, Here my present for Christmas: a new version of HomeBox, the self hosted email solution. Feel free to drop comments, create issues, update the docs, etc. I released this quickly before going on vacation, so you may find some issues. However, this is mostly stable, and the code is easy to modify. Also, you can now add and remove components individually, with an Ansible playbook. https://github.com/progmaticltd/homebox System installation and features - Custom Debian installer generation with full disk encryption and fully automatic installation. - Unlock the system upon boot by entering the passphrase through SSH. - Install packages only from Debian stable (Bullseye). - Automatic letsencrypt certificates generation using Lego and DNS challenge. - Automatic security updates (optional). - Centralised authentication with an LDAP users database, SSL certificate, password policies, PAM integration. - AppArmor activated with a profile for all daemons. - XKCD Random passwords generated and saved into pass (or on file system). - Can be used at home, on a dedicated or virtual server hosted online. - Flexible IP address support: IPv4 only, IPv6 only, and IPv4+IPv4 or IPv4+IPv6. - Embedded DNS server, with CAA, DNSSEC and SSHFP (SSH fingerprint) support. - Grade A https sites, HSTS implemented by default. - Automatic configuration of OpenPGP Web Key Directory. - Automatic firewall rules for inbound, outbound and forwarding traffic, using nftables. - Restricted outbound web sites access to the minimum. - Automatic update of DNS keys, DNS servers and glue records on Gandi. Emails - Postfix configuration and installation, with LDAP lookups, internationalised email aliases, fully SSL compliant. - Generate DKIM keys, SPF and DMARC DNS records. The DKIM keys are generated every year. - Automatic copy of sent emails into the sent folder. - Automatic creation of the postmaster account and special email addresses using RFC 2142 specifications. - Dovecot configuration, IMAPS, POP3S, Quotas, ManageSieve. - Simple spam and ham learning by moving emails in and out the Junk folder - Sieve and vacation scripts. - Virtual folders for server search: unread messages, conversations view, all messages, flagged and messages labelled as "important". - Email addresses with recipient delimiter included, e.g. john.doe+lists(a)dbcooper.com. - Optional master user creation, e.g. for families with children or moderated communities. - Server side full text search inside emails, attached documents and files and compressed archives, with better results than GMail. - SOGo webmail with sieve filters management, password change form, Calendar and Address book management, GUI to import other account emails. - Powerful and light antispam system with rspamd and optional access to the web interface. - Antivirus for inbound and outbound emails with clamav (optional). - Automatic configuration for Thunderbird and Outlook using published XML and other clients with special DNS records (RFC 6186). Calendar and Address book - Install and configure a CalDAV / CardDAV server, with automatic discovery (RFC 6186). - Groupware functionality in a web interface, with SOGo. - Recurring events, email alerts, shared address books and calendars. - Mobile devices compatibility: Android, Apple iOS, BlackBerry 10 and Windows mobile through Microsoft ActiveSync. Other optional features - Incremental backups, encrypted, on multiple destination (SFTP, S3, Samba share or USB drive), with email and Jabber reporting. - Jabber server, using ejabberd, with LDAP authentication, direct or offline file transfer and optional server to server communication. - Static web site skeleton configuration, with https certificates and A+ security grade by default. Development - YAML files validation on each commit, using travis-ci. - End to end integration tests for the majority of components. - Playbooks to facilitate the installation or removal of development packages. - Global debug flag to activate the debug mode of all components. - Fully open source Ansible scripts licensed under GPLv3. Merry Christmas, André

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Sieve duplicates
by Ferenc 28 Dec '22

28 Dec '22

Hi list, I’m trying this again from a different account because of lots of SPF warnings. I have Sieve scripts that duplicate e-mails. I don’t want that. My dovecot version is 2.3.4.1 (f79e8e7e4), Pigeonhole version 0.5.4 on Linux 5.4.189-2-pve x86_64 Debian 10.13. My scripts get called on an imap COPY action (imapsieve extension). The mail is fed to an external script (spam/ham training or retraining) via a pipe :copy action (vnd.dovecot.pipe extension). An header is added to keep track of what happened (editheader extension). I use "if header :contains” for my (simple) logic. If contains header X, do this, add header Y. If contains header Y, do that, add header X. I end each "if” part with “keep;" and “stop;” commands. Simple versions of the scripts, without the if-then construct, seem to work ok with imapsieve. As soon as I try to use if-then-else I find a duplicate of the processed e-mail; the original mail seems to be untouched, the duplicate appears to have been processed. With macos mail not all duplicates show up but with Roundcube webmail I can see them all. The scripts are like this: # without if-then require … pipe :copy … addheader … keep; # with if-then require … if header :contains pipe :copy … addheader … keep; stop; if not exists pipe :copy … addheader … keep; stop; keep; The scripts get called from “imapsieve_mailbox1_before” for example. Cheers, Ferenc

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Dovecot v2.3.20 released
by Aki Tuomi 28 Dec '22

28 Dec '22

We are pleased to release v2.3.20 of Dovecot. https://dovecot.org/releases/2.3/dovecot-2.3.20.tar.gz https://dovecot.org/releases/2.3/dovecot-2.3.20.tar.gz.sig Binary packages in https://repo.dovecot.org/ Docker images in https://hub.docker.com/r/dovecot/dovecot Regards, Aki Tuomi Open-Xchange oy -- + Add dsync_features=no-header-hashes. When this setting is enabled and one dsync side doesn't support mail GUIDs (i.e. imapc), there is no fallback to using header hashes. Instead, dsync assumes that all mails with identical IMAP UIDs contains the same mail contents. This can significantly improve dsync performance with some IMAP servers that don't support caching Date/Message-ID headers. + lua: HTTP client has more settings now, see https://doc.dovecot.org/admin_manual/lua/#dovecot.http.client + replicator: "doveadm replicator status" command now outputs when the next sync is expected for the user. - LAYOUT=index: duplicate GUIDs were not cleaned out. Also the list recovery was not optimal. - auth: Assert crash would occur when iterating multiple userdb backends. - director: Logging into director using master user with auth_master_user_separator character redirected user to a wrong backend, unless master_user_separator setting was also set to the same value. Merged these into auth_master_user_separator. - dsync: Couldn't always fix folder GUID conflicts automatically with Maildir format. This resulted in replication repeatedly failing with "Remote lost mailbox GUID". - dsync: Failed to migrate INBOX when using namespace prefix=INBOX/, resulting in "Remote lost mailbox GUID" errors. - dsync: INBOX was created too early with namespace prefix=INBOX/, resulting a GUID conflict. This may have been resolved automatically, but not always. - dsync: v2.3.18 regression: Wrong imapc password with dsync caused Panic: file lib-event.c: line 506 (event_pop_global): assertion failed: (event == current_global_event) - imapc: Requesting STATUS for a mailbox with imapc and INDEXPVT configured did not return correct (private) unseen counts. - lib-dict: Process would crash when committing data to redis without dict proxy. - lib-mail: Corrupted cached BODYSTRUCTURE caused panic during FETCH. Fixes: Panic: file message-part-data.c: line 579 (message_part_is_attachment): assertion failed: (data != NULL). v2.3.13 regression. - lib-storage: mail_attribute_dict with dict-sql failed when it tried to lookup empty dict keys. - lib: ioloop-kqueue was missing include breaking some BSD builds. - lua-http: Dovecot Lua HTTP client could not resolve DNS names in mail processes, because it expected "dns-client" socket to exist in the current directory. - oauth2: Using %{oauth2:name} variables could cause useless introspections. - pop3: Sending POP3 command with ':' character caused an assert-crash. v2.3.18 regression. - replicator: Replication queue had various issues, potentially causing replication requests to become stuck. - stats: Invalid Prometheus label names were created with specific

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Happy Holidays From SCOM.CA Internet Services Inc.
by Paul Kudla 23 Dec '22

23 Dec '22

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Pigeonhole v0.5.20 released
by Aki Tuomi 22 Dec '22

22 Dec '22

We are pleased to release v0.5.20 of Pigeonhole. https://pigeonhole.dovecot.org/releases/2.3/dovecot-2.3-pigeonhole-0.5.20.t… https://pigeonhole.dovecot.org/releases/2.3/dovecot-2.3-pigeonhole-0.5.20.t… Binary packages in https://repo.dovecot.org/ Docker images in https://hub.docker.com/r/dovecot/dovecot Regards, Aki Tuomi Open-Xchange oy -- * No changes - release done to keep version numbers synced.

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OT: Two simultaneous POP3 connections from Outlook
by kjohnson＠eclypse.org 21 Dec '22

21 Dec '22

Hello, I recognize this may be somewhat off-topic, but my search-fu has failed to provide useful results, so I ask for pointers to further information. Today, while examining Dovecot logs, I found a case where the Outlook mail client (probably 2016 or later) on a user's computer opened two simultaneous, or at least overlapping, POP3 connections to Dovecot. This did not go well, naturally. Warning: Transaction log file .../mail/.imap/INBOX/dovecot.index.log was locked for 156 seconds (rotating while syncing) If anyone else has found useful information about this peculiar behavior for an email client, I would be pleased to receive a pointer in that direction. Thank you. Ken

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How is URLAUTH broken, and for how long?
by Andy Balholm 21 Dec '22

21 Dec '22

The documentation for imap_urlauth_host says: > Warning > > URLAUTH in current versions of Dovecot is broken in several ways. > This will be fixed in the future, but activating URLAUTH support > on production systems is not recommended. In what ways is it broken? Is anyone actually working on fixing it? Andy

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Re: SPF DNS Error / R_SPF_DNSFAIL
by Jochen Bern 20 Dec '22

20 Dec '22

On 19.12.22 13:20, Carlos Mogas da Silva wrote: > On Mon, 2022-12-19 at 12:38 +0100, Benny Pedersen wrote: >> Carlos Mogas da Silva skrev den 2022-12-19 11:57: >>> What can cause this error and/or how can I debug it? >> >> try avoid to many dns querys > > Even on a caching dns server? Any ideas on why it is failing? I don't remember it being in an actual RFC, but SPF records are supposed to not require more than 10 DNS queries to fully resolve. https://dmarcian.com/spf-survey/ gives cttexpresso.pt an all-green result, but notes that the "+a:email.reditus.pt" part is inoperational ("no A or AAAA RRs found", in fact, I'm getting an NXDOMAIN for the FQDN). Regards, -- Jochen Bern Systemingenieur Binect GmbH

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SPF DNS Error / R_SPF_DNSFAIL
by Carlos Mogas da Silva 20 Dec '22

20 Dec '22

Hi list. My incoming messages are getting R_SPF_DNSFAIL and an error on the Authentication-Results header: spf=temperror (mail01.r3pek.org: error in processing during lookup of no-reply(a)cttexpresso.pt: DNS error) I see the DNS request on my DNS server and a "working" reply going out. What can cause this error and/or how can I debug it?

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mail filters
by mick.crane 20 Dec '22

20 Dec '22

I'm using what ever is in Debian Bookworm, I'm pretty sure. These filters? I collect from different email addresses like gmail and that. If filter for the "Sent to" email address, move to this directory If "From" contains "blah", move to this other directory. If something is Sent to and also From contains "blah" then I get 2 copies of the message in both filter directories. How can I fix this? regards mick

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