It might be worth noting the difference between theory and practice. SMTP (Simple Mail Transfer Protocol), which is the space e-mail is built on doesn't really prevent spoofing. I think that's where this quote comes from.

However while SMTP is part of e-mail as is now, its not he only thing in the pipeline. While I am sure there are some completely vanilla implementation of this in the wild, the vast majority of people will be using one of the few "big" stacks, which come with a lot of extras to stop this kind of behaviour.

As the goal of spamming is to reach as many (and sadly most gullible) people as possible: the cost of having the majority of cases filtered out in order to get the credibility of a real address is not good. This is particularly true if the scam involves effort of the part of the scammer to proceed as the sort of person skeptical enough to notice "[email protected]" looks wrong is likely a target you want to weed out early.

It might be worth noting the difference between theory and practice. SMTP (Simple Mail Transfer Protocol), which is the basis of e-mail, doesn't really prevent spoofing. I think that's where this quote comes from.

However while SMTP is part of e-mail as is now, its not he only thing in the pipeline. While I am sure there are some completely vanilla implementation of this in the wild, the vast majority of people will be using one of the few "big" stacks, which come with a lot of extras to stop this kind of behaviour.

As the goal of spamming is to reach as many (and sadly most gullible) people as possible: the cost of having the majority of cases filtered out in order to get the credibility of a real address is not good. This is particularly true if the scam involves effort of the part of the scammer to proceed as the sort of person skeptical enough to notice "[email protected]" looks wrong is likely a target you want to weed out early.