Hi, 
 
 In account we need to add a validtion on email domain field which is in email format eg. sudhir@gmail.com

 Field name is Email_Domain__c

 if any of the mail contains “gmail.com”, “hotmail.com”, “yahoo.com”, “gmx.de”, “googledomain.com”, “mail.ru”, “web.de”, “live.com”, “aol.com”, “gmx.net”, “yandex.ru”, “me.com”, “msn.com”, “comcast.com”, “hushmail.com”, “yahoo.de”, “hotmail.co.uk”, “lavabit.com”, “sbcglobal.net”, “safe-mail.net”, “ymail.com”, “yahoo.co.uk”

It should through message saying personal email cannot be entered.

Thanks
Sudhir