Was using gzm55/pptp-client, should be gzm55/davmail.
@@ -9,7 +9,7 @@ docker run --net=host \
-e DAVMAIL_SERVER_CERTIFICATE_HASH=<optional-certificate-hash>
-e DAVMAIL_NTLM_DOMAIN=<optional-windows-domain>
-d \
- gzm55/pptp-client
+ gzm55/davmail
```
Accepted docker environment variables: