SMTPConnectionClosedException is used to indicate the premature or
unexpected closing of an SMTP connection resulting from a
{@link org.apache.commons.net.smtp.SMTPReply#SERVICE_NOT_AVAILABLE SMTPReply.SERVICE_NOT_AVAILABLE }
response (SMTP reply code 421) to a
failed SMTP command. This exception is derived from IOException and
therefore may be caught either as an IOException or specifically as an
SMTPConnectionClosedException.
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