If I send a message to a bad address, why don I get a SendFailedException or TransportEvent indicating that the address is bad?
There is no end-to-end address verification on the Internet. Often a message will need to be forwarded to several mail servers before reaching one that can determine whether or not it can deliver the message. If a failure occurs in one of these later steps, the message will typically be returned to the sender as undeliverable. A successful “send” indicates only that the mail server has accepted the message and will try to deliver it.
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