I want to develop an upplication that involves email servers. One of it's features will be keeping a sent email even if the server doesn't recognize the address. As I am not familiar with exchange servers (and mail servers in general) answer may vary from: "it's trivial - go to screen so and so in exchange and turn a bit" via "it's not legal" to "write your own mail server". Thnaks, Eran.

You didn't specify a version of Exchange and reading between the lines you haven't got one yet so let's assume E2010. See: http://technet.microsoft.com/en-us/library/bb691132.aspx to create a catch-all mailbox which will take delivery of all messages that are sent to email addresses that do not exist in Active Directory. "eran_z" wrote in message news:a77feef8-6745-47ff-91ed-e9a28ac56f69... I want to develop an upplication that involves email servers. One of it's features will be keeping a sent email even if the server doesn't recognize the address. As I am not familiar with exchange servers (and mail servers in general) answer may vary from: "it's trivial - go to screen so and so in exchange and turn a bit" via "it's not legal" to "write your own mail server". Thnaks, Eran. Mark Arnold, Exchange MVP.

Back in Exchange 2003, there was an example of an event sink for a catchall mailbox... http://support.microsoft.com/kb/324021