>won’t prevent 99.999% of spam because nobody will set it up I would. And anyone who doesn't want the spam would. Right now we send "550 Too much spam" respons

>won’t prevent 99.999% of spam because nobody will set it up I would. And anyone who doesn't want the spam would. Right now we send "550 Too much spam" responses to docs and sharepoint emails. I'd be happy to, as an alternative, use an interface at Google or Microsoft that let me whitelist the organizations who can send files.