Our server recently got listed in Backscatter.org - although we have doublebounces set to off in Nodeworx 3,
After running a test for checking if we block backscatter - we don’t
(after telneting into the box:
mail from: email@example.com
RCPT TO: NoSuchUser@my.domain.com
I get a response like this:
250 2.1.5 NoSuchUser@my.domain.com
550 User unknown
I have a standard CentOS 5x+Nodeworx3x config. What could be the cause and what can I do?
If “Bounce On” isn’t enabled in SiteWorx->Email->Overview, messages for invalid recipients won’t be rejceted at the SMTP level. It will either silently accept and delete the message, or deliver the message to a catchall, if that is how it is setup.
That’s the first thing I would investigate.
the main problem was solved (with chkuser), but there is another - also connected with backscatter - how can i disable Sender callouts (Sender Verify / SAV)?