Answer
A 'Finished' status in Application Messages only confirms that IFS Connect successfully handed the message off to your configured mail relay/server — it isn't proof that the email was actually delivered to, or received by, the end recipient's mailbox. Whether an individual message was actually delivered depends entirely on what happens downstream at the mail server/relay level (spam filtering, relay failures, mailbox issues), which IFS has no visibility into and can't report on. If you need genuine proof of delivery rather than just proof that IFS handed it off, that has to come from your mail server/relay's own logs, or a dedicated integration that captures delivery confirmation back into IFS.