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"250 Delivered" is always given so that you can't sniff email addresses even if no such user exists on the server. It's like that whole "email and/or password
by Xeoncross 10y ago
"250 Delivered" is always given so that you can't sniff email addresses even if no such user exists on the server.
It's like that whole "email and/or password wrong" error when you try to login to a website. They don't want to give away who is registered on the site.