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Usually this type of enforcement should be done on network level, not on SMTP level.
IMHO this isn't something implemented for one protocol only and this isn't only relevant for SMTP.
this isn't about "good idea" only. But about how this is rated in relation to other ideas and how many customers need it.
In Exchange we can do the trick, we can block entire country's. The iprange-tables / region's are updated every week. Works perfectly. Even a community/free SMTP service "MailScanner" can block by Country.
It was in my opinion that the amount of votes does not matter. :-) It's a good idea or it's not.
ok, understand the request. Lets see how many votes this idea will get.