_Originally created by @intrigeri on [#11613 (Redmine)](https://public-redmine-archive.tails.boum.org/code/issues/11613)_ Apparently nothing prevents us from installing Icedove from Debian, without our patches, except our hopefully higher version number. But it happens that we’re lagging behind (tails/tails#11530), so we need to add APT pinning to prevent that. Feature Branch: feature/11714-icedove-45.2.0-1 Parent Task: tails/tails#5663