Allow handling smtp status code SyntaxError for invalid recipient addresses. #764
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When sending email with multiple recipients and one or more recipient addresses are not accepted by server the whole email is aborted. In my case it was email with lots of BCC recipients where one of them had invalid email address, the whole email was not delivered.
This PR adds the
SmtpStatusCode.SyntaxErrorcase toProcessRcptToResponseand allows theOnRecipientNotAcceptedto handle the error.