Dovecot is een mailserver met ondersteuning voor imap, pop3, ipv6, ssl en tls, en valt deels onder een MIT- en deels onder een Lgplv2.1-licentie. Voor het opslaan van mailberichten kan gebruik worden gemaakt van maildir-, mbox- en het zelf ontwikkelde dbox-formaat. Daarnaast kunnen mta's zoals Postfix 2.3+ en Exim 4.64+ hun smtp-authenticatieproces zonder tussenstappen uitvoeren bij Dovecot. De ontwikkelaar heeft versie 2.3.3 uitgebracht met de volgende aankondiging:
[Dovecot-news] v2.3.3 released
- doveconf hides more secrets now in the default output.
- ssl_dh setting is no longer enforced at startup. If it's not set and non-ECC DH key exchange happens, error is logged and client is disconnected.
- Added log_debug=<filter> setting.
- Added log_core_filter=<log filter> setting.
- quota-clone: Write to dict asynchronously
- --enable-hardening attempts to use retpoline Spectre 2 mitigations
- lmtp proxy: Support source_ip passdb extra field.
- doveadm stats dump: Support more fields and output stddev by default.
- push-notification: Add SSL support for OX backend.
- NUL bytes in mail headers can cause truncated replies when fetched.
- director: Conflicting host up/down state changes may in some rare situations ended up in a loop of two directors constantly overwriting each others' changes.
- director: Fix hang/crash when multiple doveadm commands are being handled concurrently.
- director: Fix assert-crash if doveadm disconnects too early
- virtual plugin: Some searches used 100% CPU for many seconds
- dsync assert-crashed with acl plugin in some situations.
- mail_attachment_detection_options=add-flags-on-save assert-crashed with some specific Sieve scripts.
- Mail snippet generation crashed with mails containing invalid Content-Type:multipart header.
- Log prefix ordering was different for some log lines.
- quota: With noenforcing option current quota usage wasn't updated.
- auth: Kerberos authentication against Samba assert-crashed.
- stats clients were unnecessarily chatty with the stats server.
- imapc: Fixed various assert-crashes when reconnecting to server.
- lmtp, submission: Fix potential crash if client disconnects while handling a command.
- quota: Fixed compiling with glibc-2.26 / support libtirpc.
- fts-solr: Empty search values resulted in 400 Bad Request errors
- fts-solr: default_ns parameter couldn't be used
- submission server crashed if relay server returned over 7 lines in a reply (e.g. to EHLO)
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