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https://wiki.dovecot.org/procmail
Procmail delivers mails into Maildir folders, if a slash is appended to the folder name (e.g. ".spam/"). But Procmail itself could not update the Dovecot index files. This decreases the performance a bit, because the Dovecot IMAP or POP3 server has to add new mails for the index files.
https://www.mhonarc.org/archive/html/procmail/2010-12/msg00025.html
The problem is that when I uncomment last delivery rule, the user defined file ".procmailrc" isn't parsed (any mail is delivered before parsing user file). With uncommented last rule local delivery is done by procmail mechanism, not by dovecot delivery LDA - witch is suboptimal for performance reasons. I've tried something like:
https://serverfault.com/questions/475053/how-to-enable-maildir-in-dovecot-deliver-with-sendmail-local-procmail
There is documentation around on how to make /usr/local/bin/procmail work with delivering to a maildir. However, it is my understanding that it is also possible to avoid procmail altogether, and h...
https://unix.stackexchange.com/questions/145771/mail-filtering-with-procmail-in-a-postfix-dovecot-system-with-virtual-users
I had a postfix/dovecot system with mail users working. After unsuccessfully following a few tutorials online to enable procmail, now I have an unusable system. What I want is to enable procmail
https://wiki1.dovecot.org/MailboxFormat/Maildir
Maildir. This format debuted with the qmail server in the mid-1990s. Each mailbox folder is a directory and each message a file. This improves efficiency because individual emails can be modified, deleted and added without affecting the mailbox or other emails, and makes it …
https://wiki1.dovecot.org/LDA/Sieve
The Dovecot Sieve plugin provides mail filtering facilities at time of final message delivery using the Sieve language. By writing Sieve scripts, users can customize how messages are delivered, e.g. whether they are forwarded or stored in special folders.
https://wiki.dovecot.org/QuestionsAndAnswers
Procmail seems to have some intermittent delivery problems if you use the system-wide configuration with Maildir style mailboxes. Please notice: Dovecot creates a directory.INBOX in the user's ~/Maildir (or whatever was specified as the rootdir in the "mail environment", see the separate question about that).
https://wiki.dovecot.org/MboxLocking
# procmail -v 2>&1grep Locking Locking strategies: dotlocking, fcntl() Postfix. Postfix has two different ways to deliver to mboxes. One is the "mailbox" transport and another one is the "virtual" transport. # postconf mailbox_delivery_lock mailbox_delivery_lock = fcntl, dotlock # postconf virtual_mailbox_lock virtual_mailbox_lock = fcntl
https://help.ubuntu.com/lts/serverguide/postfix.html
Another option for configuring Postfix for SMTP-AUTH is using the mail-stack-delivery package (previously packaged as dovecot-postfix). This package will install Dovecot and configure Postfix to use it for both SASL authentication and as a Mail Delivery Agent (MDA).
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