[Mimedefang] md_check_against_smtp_server and md_graphdefang_log

[kd6lvw at yahoo.com]

--- On Mon, 3/25/13, James Curtis <jameswcurtis at hotmail.com> wrote:
> From what I have read of the documentation (man
> mimedefang-filter, Rejecting Unknown Users Early section),
> the md_check_against_smtp_server is meant to verify that the
> email address someone is sending to actually exists on the
> server they are trying to send to (through the filter server
> that is running mimedefang).  To the best of my
> knowledge it doesn't check the sender to make sure that the
> sender exists on the domain that the sending email
> address.  

Exchange the sender and recipient mailboxes (for the recipient(s), pick one if more than one) and it can be used to perform a callback which is abusive, intended or not.