Configure IMAP input

Setting	Default	Effect
Host / port	Empty / 0	IMAP endpoint. The class does not assign a conventional port; configure the reviewed server/TLS port explicitly.
Mailbox	Empty	Mailbox/folder to poll.
After receiving	Delete	Mark read, move, delete or do nothing after download. Select only with a duplicate/recovery design.
Move-to mailbox	Empty	Required when post-receive action is move.
Use SASL	Cleared	Enables the SASL authentication path.
From / To filter	Empty / empty	Sender and recipient filters. Treat headers as untrusted and test exact matching.

Shared user/password/OAuth/TLS/timeouts apply, subject to the concrete client. Test mailbox rights, unread/seen flags, attachment selection, duplicate messages, move/delete failure, malformed/large messages, TLS and service restarts. Email Message-ID is useful correlation but not a universal uniqueness guarantee. Preserve the original message until downstream processing and replay behaviour are proved. See shared security.