Provide alternative of %{key} for incoming emails to only render hash, i.e. %{key_hash}

Problem

We have an email service, which isn't able to process "long" email adresses. The emails aren't received in the mail box.

Suggestion

Provide an alternative to %{key}, which just renders the "hash", instead the project slug + hash + issue.

I.e.

in-%{key}@example.com --> in-project-slug-HASHHASH-issue@example.com

in-%{key_hash}@example.com --> in-HASHHASH@example.com