bper
I'm not saying don't worry or check your security but it happens all the time on my sendmail server
What I have done is add entries to /etc/mail/virtusertable listing all genuine email addresses mapped to users like this
Then the last entry is
Code:
@mydomain.com error:nouser User unknown
If you want to do this remember to add entries for admin@mydomain, hostmaster etc because only entries in this table will be allowed everything else is rejected
You need to create virtusertable.db from virtusertable which on redhat is simply run make on the command line while you are in the /mail directory
You can also check your server
here just add your domain name in the first box
Something else you may find of interest is
SpamBouncer I find it very effective against spam and is very configurable
Pete