There's a closed pull request on the void-packages repository

New package: opensmtpd-filter-dkimsign-0.5
https://github.com/void-linux/void-packages/pull/38254

Description:
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**Depends on libopensmtpd** (#38253)

#### Testing the changes
- I tested the changes in this PR: **YES**
  - Integration test with a fully configured OpenSMTPD server: Passed DKIM test provided by https://appmaildev.com/en/dkim

#### New package
- This new package conforms to the [quality requirements](https://github.com/void-linux/void-packages/blob/master/Manual.md#quality-requirements): **YES**
  - The software needs to be compiled.

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#### Local build testing
- I built this PR locally for my native architecture, x86_64
- I built this PR locally for these architectures:
  - i686 crossbuild