Webmail Login URL domainname/webmail not working

Solution :

1. Check whether the name servers are pointed to our server properly.
2. If you have changed the nameservers recently, it will take 24 to 48 hours to reflect which depends on the ISP.
3. Check whether you are giving the domain name properly.
4. Until the name server reflection you can use servername/webmail to access the mails.