troubles connecting em client to zentyal exchange


I’m using zentyal mail server in exchange mode. outlook and ios mail works fine with it but I would like to use em client instead of outlook because it’s way better. 

having trouble with connection to server. on authentication step i receive message: em client found server and it’s ok but cannot verify user login or password. 

what should i do? 

thanks in advance 

seems like the problem is with authentication.
Are you using the full email address (with domain) for both the Address field and the Username?
Can you login with the same password into webmail?


I’m using full email address for both fields. webmail works fine