Hi Hamish, On Wed, 09 Jul 2014 17:27:08 +1000 Hamish Moffatt <ham...@cloud.net.au> wrote: > > Consider implementing SPF to prevent this. > http://en.wikipedia.org/wiki/Sender_Policy_Framework > > In summary, through the DNS you publish a list of all servers authorised > to send mail from your domain, and how strict you want recipients to be. > An SPF-aware receiving host will check the DNS when it receives mail, > and reject any received from unlisted servers. This prevents your email > address being forged.
SPF is broken by design (consider forwarding - including mailing lists). Unfortunately, some of the bigger players are now using it to make decisions :-( It also doesn't help for those with email addresses in domains that other people using the same domain post from lots of different places. (e.g. other members of my family use various ISP's outgoing mail servers) -- Cheers, Stephen Rothwell
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