i'm no expert - just querying something i've been told. our company has had reports for about a week of people sending us emails for example to [email protected] and these emails either not being delivered or a message going back to sender saying no such user on that server. our server domain name eg @whatever.org.uk is registered to our company but we've been told that someone else could set up a @whatever.org.uk email addresses. therefore if someone sends me an email then it might go to the otherone first, find that i'm not listed and go back to the sender as no such user. can this be right and also if it is can i trace who has set up the other eg @whatever.org.uk addresses?