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

https://github.com/Anachron/void-packages davmail_5.2.0
https://github.com/void-linux/void-packages/pull/13151

davmail: update to 5.2.0, fix maintainer email, update distsource and…
… remove wrksrc-var

Build  tested locally.

A patch file from https://github.com/void-linux/void-packages/pull/13151.patch is attached