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Another comment says they do exactly this..

Have a read of the comments for a sample of just how much people hate this.

I was surprised over how much hate I received on my comment, even with this feature we get a ton non valid emails. I don't want to think of how many we would get without it.

"even with this feature"

Have you measured whether this feature actually helps anything? As the author said, people can see typos. But people who don't know their own email addresses will happily repeat errors.

and as someone with first.last@gmail.com I know that there are many people who give out wrong email addresses.

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