outlook and thunderbird not login
My postfix is running and webmail (uebimiau) send and receive emails of user@domain, but email clients (oultlook, thunderbird, etc) not login in server.
The error message is: Bad Login. Email client is configured in POP3 with login user@domain in server IP or DNS name. DNS is ok (ispconfig panel is working). User is ok (webmail is working)...
Please, help me...