On Fri, 19 Oct 2007, M Core wrote: > Sometimes I receive an email to my admin account stating that the email > I sent to an [EMAIL PROTECTED] was not sent. > The message has an attachment and when you open them down eventually you > find a spam email that is FROM the [EMAIL PROTECTED] to a > [EMAIL PROTECTED] > > How is this happening? What do I look at? > >> From an external account I teleneted in and sent a message from the > [EMAIL PROTECTED] to [EMAIL PROTECTED] And it worked... > so I thought it is an open relay. > But when I try any of the websites etc. to check for this none of them > can find an open relay on my mail server.
It's not an open relay. It accepts email for [EMAIL PROTECTED] That's where the bounce went to, because somebody forged the envelope from header to your valid account. But now that you mentioned it - is there a way to make Courier make an additional check? e.g. it receives a message: From: [EMAIL PROTECTED] To: [EMAIL PROTECTED] Normally, this is not too plausible to check if from is for a non-locally hosted domain, but if from is from a locally hosted domain, can we make Courier check if from is deliverable, and if not, reject with "unknown sender" or some such? On a separate note, is it possible to get Courier to do return path verification? i.e. for the from address, look up mx, connect, and do: HELO, MAIL FROM, RCPT TO, QUIT, just to see if the FROM address is deliverable? Gordan ------------------------------------------------------------------------- This SF.net email is sponsored by: Splunk Inc. Still grepping through log files to find problems? Stop. Now Search log events and configuration files using AJAX and a browser. Download your FREE copy of Splunk now >> http://get.splunk.com/ _______________________________________________ courier-users mailing list [email protected] Unsubscribe: https://lists.sourceforge.net/lists/listinfo/courier-users
