I can use the sendMail action but the sendMailWithAttachment does not work, neither do other attachment actions. The all report the same thing in the logs:
2023-01-02 21:40:44.092 [ERROR] [internal.handler.ScriptActionHandler] - Script execution of rule with UID ‘test-1’ failed: ‘sendMailWithAttachment’ is not a member of ‘org.openhab.core.thing.binding.ThingActions’; line 25, column 2, length 133 in test
Looking at the code, I expect only methods sendMail and sendHtmlMail but with different variants to be able to attach one attachment or a list.
A mapping table should be added in the documentation, even if it is very simple.