We have a SBS 2003 server with Microsoft exchange 2003 mail server.
Recently we have seen that the SMTP queue in the exchange system manager shows up 100's of emails
in the queue . When I opened up some of the email properties to see the sender address, it shows up some
other email id, which is not from our domain. Looks like some 3rd party email id.
1) Is someone trying to send emails from our mail server ?
2) Our exchange server is not set to relay.
Any suggestions as how this can be controlled or is it something which is not to be worried about ?