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https://serverfault.com/questions/112958/postfix-aliases-and-duplicate-e-mails-how-to-fix
If you are using a reasonably recent Dovecot with Pigeonhole implementation of Sieve, there is a special extension that can be used for on-delivery deduplication. In Dovecot older than 2.2.18, the name of this extension is "vnd.dovecot.duplicate" and it's disabled by default, in newer releases the extension is called "duplicate" and should be already enabled, but enabling it explicitly won't harm.
https://serverfault.com/a/772722
If you are using a reasonably recent Dovecot with Pigeonhole implementation of Sieve, there is a special extension that can be used for on-delivery deduplication. In Dovecot older than 2.2.18, the name of this extension is "vnd.dovecot.duplicate" and it's disabled by default, in newer releases the extension is called "duplicate" and should be already enabled, but enabling it explicitly won't harm.
https://wiki2.dovecot.org/Plugins/FTS/Solr
Dovecot creates the following fields: Lucene does duplicate suppression based on the "id" field, so even if Dovecot sends the same message multiple times to Solr it gets indexed only once. This might happen currently if multiple searches are started at the same time.
https://support.plesk.com/hc/en-us/articles/115001873973-Is-it-better-to-choose-Dovecot-or-Courier-IMAP-on-Plesk-server-
Jan 31, 2019 · Plesk recommends using Dovecot. For additional information refer to Plesk documentation. In general, the choice itself should be made based on your environment and the specific business needs. Both these services have features that may help to configure mail delivery more efficient depending on the business structure and server configuration.
http://dovecot.2317879.n4.nabble.com/duplicates-with-multiple-To-CC-and-sieve-redirect-copy-td3088.html
There are a few options: * You can use Procmail as primary delivery agent and invoke dovecot-lda/sieve from within Procmail once Procmail has determined that it is not a duplicate. * Invoke procmail from Sieve using the pipe extension (i.e. the other way around).
https://wiki.dovecot.org/LDA/Exim
Dovecot LDA with Exim. System users. Change the localuser router to use dovecot_delivery transport: localuser: driver = accept check_local_user # local_part_suffix = +* : -* # local_part_suffix_optional transport = dovecot_delivery. check_local_user is required. It makes Exim execute the transport with the user's UID and GID and it also sets HOME environment.
https://wiki.dovecot.org/VirtualUsers/Home
Duplicate mail check database is in user's home directory. Suppression of duplicate rejects/vacations won't work if home directory isn't specified. Debugging: If an imap or pop3 process crashes, the core file is written to the user's home directory.
http://wiki2.dovecot.org/Pigeonhole/Sieve
Pigeonhole Sieve Interpreter. The Pigeonhole project provides Sieve support as a plugin for Dovecot's Local Delivery Agent (LDA) and also for its LMTP service. The plugin implements a Sieve interpreter, which filters incoming messages using a script specified in the Sieve language . The Sieve script is provided by the user and, using that Sieve script, the user can customize how incoming messages are …
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