Reply detection
The most important thing a follow-up can do is stop.
Nothing burns goodwill faster than a scheduled follow-up that arrives after someone already replied. CraftNudge watches the inbox and shuts the sequence down the moment a real answer lands.
How it knows
The worker polls each connected inbox over IMAP and matches incoming mail back to the exact message it sent, by Message-ID. Because it matches on your own sends, unrelated mail (including warmup traffic from whatever tool you warm with) never gets mistaken for a campaign reply.
A real reply
The sequence stops immediately. You read and answer from one place, in the same thread.
A bounce
Detected, classified by DSN code, and the lead is marked bounced, separated from genuine replies so it never counts as engagement.
An out-of-office
Recognised as an automatic reply, not a human one, and not counted as a reply. By default it does not stop the sequence. It holds the lead until the day after the return date it gives, or for seven days when it gives none, so the next step does not land in an inbox nobody reads. Or set the campaign to stop on it.
A refused sign-in
If the inbox stops accepting its IMAP sign-in, as it does when its app password is revoked, the inbox stops sending, since its replies can no longer be read. It sends again once the sign-in is fixed and the inbox passes its connection test. An inbox that is only unreachable for a while keeps going.
A reply from a colleague
A reply from anyone at the same company can stop the whole company, if you switch that on, so you stop pitching a firm that already answered.
Replies land in one place where you can read the full message and answer in-thread. It is a focused reply view, not a full shared-inbox CRM. That is a different product, and we are honest about not being it.