How are these emails being delivered?

[medric2]

Hi
Some of my users are recieving emails from various addresses which are not addressed to them. These mails are addressed to users which don't exist at this domain. If I try to send a mail to these non-existant users from an external email account I receive a message saying that the user does not exist. Why is Notes deliviering mail to people when their name does not appear anywhere in the header of that message?

Has anyone else experienced this and can anyone explain how it is happening.
Thanks in advance.
Dave

 

[koresnordic]

This is a case of a virus spoofing (lying) about who sent it. Someone out there is infected and their address book contain your users e-mail. SO the virus says it came from them. When it is returned, it goes to who it thinks was the sender - in this case your users. It is difficult to stop these fake returned messages.



Graham

 

[MarkhP]

I think it goes roughly like this...
SMTP mail has what is called a SMTP Envelope. This has the real addressees details in it which the server interprets to send the mail to the correct valid person. The server strips this information out and the 'To' field (which is different from the field in the SMTP envelope) is then what you see as the To address. You wont be able to see the SMTP envelope details after it has arrived at Notes.