1

Is it possible to write a Sieve rule like

if envelope :detail "to" "$x" {
  fileinto "inbox.$x";
}

but for all possible $x? I.e. if the user created a folder inbox.foo I want mail addressed to user+foo@domain to land there automatically. The spec doesn't seem to support this.

1

Turns out that's what the variables extension is for.

require "variables";
if envelope :detail :matches "to" "*" {
  fileinto "inbox.${1}";
}
0

For me this one worked:

require ["variables", "fileinto", "envelope", "subaddress", "mailbox"];

if envelope :matches :detail "to" "*" {
    # you can prefix with INBOX/ or INBOX. if necessary
    # remove :create if you want to permit only existing mailboxes
    fileinto :create "${1}";
}

See the example from here: https://wiki.dovecot.org/Pigeonhole/Sieve/Examples

Obviously this would also be just an option to be turned on: lmtp_save_to_detail_mailbox=yes

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