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I recently noticed that my dovecot LDA creates a subfolder in my Maildir for mails that have a details part in the recipient address (local-part+detail@domain).

I absolutely cannot find a setting that would cause that. I have set "recipient_delimiter" in both 15-lda.conf and 90-sieve.conf. I don't have any such rule in the user sieve files, either.

How do I turn it off?

Dovecot version is 2.2.33.2 (d6601f4ec).

The logs say 

status=sent (delivered to command: /usr/lib/dovecot/deliver -c /etc/dovecot/dovecot.conf -m "${EXTENSION}")
mcandril
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  • What MTA do you use ? If it is Postfix, "recipient_delimiter = +" is set ? – Dom Jan 01 '20 at 18:30
  • Yes, I use Postfix, and the delimiter is set there, too. The logs say 'status=sent (delivered to command: /usr/lib/dovecot/deliver -c /etc/dovecot/dovecot.conf -m "${EXTENSION}")' Delivery also works in general. When one of my rules with fileinto hits, the mail is delivered correctly. If no rule hits, however, the detail string is interpreted as a folder, with dots creating subsubfolders. (me+example.net@example.org ends up in example/net) – mcandril Jan 01 '20 at 18:52
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    The log line is an important part of your question, please add it to the question. – Piotr P. Karwasz Jan 01 '20 at 19:18

1 Answers1

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By your comment above, I deduce that you configured Postfix as follows:

mailbox_command = /usr/lib/dovecot/dovecot-lda -m "${EXTENSION}"

The -m option is used to deliver the e-mail to the ${EXTENSION} (Postfix's for detail) mailbox instead of INBOX. You probably want something like this instead:

mailbox_command = /usr/lib/dovecot/dovecot-lda -f "$SENDER" -a "$RECIPIENT"

In this way your filters can still use the envelope addresses, but the unmatched messages go to INBOX as intended.

Piotr P. Karwasz
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