spam being sent using my domain

[Shane Hathaway]

Derek Davis wrote:
> I own the domain name dnadavis.net.  I set up a catch all mx entry, so
> that all email that I don't specifically account for gets forwarded to
> my gmail address.  This way, I can make up email addresses on the
> spot, which I like doing.

Perhaps a better way to do this is to use address extensions.  For
example, if you have 'me at example.com', you can also receive mail as
'me+oldnavy at example.com' and 'me+blog at example.com'.  Postfix supports
this feature but doesn't enable it by default.  It's configured using
'recipient_delimiter' in main.cf.  You might choose '.' or '-' as the
delimiter so that it isn't obvious to spammers that you're using the
feature.

Shane