Can cPanel/exim REJECT unknown addresses? in SpamCop Lounge Posted December 17, 2007 This can be done within the cPanel interface. Under Mail Manager -> Default Address Maintenance, add this to your domain: :fail: no such address here This will result in rejects like the following: 2007-12-16 10:32:00 H=spammer.example.net (706167c405e3d8) [192.168.42.101] F=<spambot[at]example.com> rejected RCPT <me[at]mydomain.example.org>: no such address here Thanks. Unfortunately, I don't have access to cPanel. I believe my hosting company (Site5) uses cPanel, but the interface they provide to us is something they developed on their own. The closest analogy I see is in my "Email Forwarders" settings - where I have my wildcard address set to ":fail: No Such User Here". However, the mail server still accepts all incoming messages and then generates a bounce after-the-fact. Your reject entry above doesn't speak to me, either. I don't see a three-digit response code - which begs the question: Is this a SMTP reject or a "bounce" message? Finally, I sent a suggestion to Site5 that they should fix this deficiency, but they have (so far) ignored me. When my renewal comes up, I am considering switching to a more email-friendly host (if I can find one).