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A comment on Did I just lose half a million dollars?. Parent comment

Re:Did I just lose half a million dollars? by emteycz on Sunday January 30, 2022 @11:06AM (#30138335)
SMTP servers are able to reply whether a user exists, and some still do. Your own server will send you a "undeliverable" message if it receives a negative reply.
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Re:Did I just lose half a million dollars? by capableweb on Sunday January 30, 2022 @11:22AM (#30138475)
Yes, but that's different. That checks if the user exists, not if the person behind the user actually has access to that user.
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