There is an updated pull request by agausmann against master on the void-packages repository

https://github.com/agausmann/void-packages libopensmtpd
https://github.com/void-linux/void-packages/pull/38253

New packages: libopensmtpd-0.7 opensmtpd-filter-dkimsign-0.5
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#### Testing the changes
- I tested the changes in this PR: **YES**
  - Integration test with and 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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A patch file from https://github.com/void-linux/void-packages/pull/38253.patch is attached