Zimbra or similar auth for NC 14

Nextcloud version (eg, 12.0.2): 14.0.4
Operating system and version (eg, Ubuntu 17.04): Centos 7
Apache or nginx version (eg, Apache 2.4.25): Httpd
PHP version (eg, 7.1): 7.2

The issue you are facing:
I want to install something similar to ZimbraDrive, for allow mail account authentication, I need this.

If is not possible, How can I back to NC 13?

Is this the first time you’ve seen this error? (Y/N):