Short answer is... you can't. But, the SPF is a good first measure, and a second option to help is a DMARC record. This won't stop them from using it, but it should reduce the number of those bounces that you get (and increase the likelihood they'll be properly marked as spam on the far side, instead of making it into inbox's).
On Tue, Jan 8, 2013 at 9:31 AM, Kizmar <kiz...@gmail.com> wrote: > I've added SPF records to my GoDaddy DNS for my domains using Google for > MX and I'm still getting "Postmaster Failed" emails that are from <random > crap>@MyDomain.com. Is there something else I can do to stop spammers from > using my domain as the from? > > -- > You received this message because you are subscribed to the Google Groups > "Gmail-Users" group. > To post to this group, send email to gmail-users@googlegroups.com. > To unsubscribe from this group, send email to > gmail-users+unsubscr...@googlegroups.com. > Visit this group at http://groups.google.com/group/gmail-users?hl=en. > For more options, visit https://groups.google.com/groups/opt_out. > > > -- You received this message because you are subscribed to the Google Groups "Gmail-Users" group. To post to this group, send email to gmail-users@googlegroups.com. To unsubscribe from this group, send email to gmail-users+unsubscr...@googlegroups.com. Visit this group at http://groups.google.com/group/gmail-users?hl=en. For more options, visit https://groups.google.com/groups/opt_out.
