https://mvnrepository.com/artifact/io.wcm.maven/io.wcm.maven.aem-dependencies/6.3.1.0000
commons-email is not included - it is impossible to reference any of the classes included in that package without manually referencing commons-email first
it's included - but with the artifact coordinates of the wrapper from adobe:
it's a rather old and outdated version.
Maybe this problem:
has something to do with it.
works for me, see this branch:
https://github.com/wcm-io/wcm-io-samples/tree/experimental/commons-email
this dependency is not available on maven central, but on the public adobe repo
https://repo.adobe.com/nexus/content/repositories/releases/