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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 I want mail addressed to user+foo@domain to land there automatically. The spec doesn't seem to support this.

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up vote 1 down vote accepted

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

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