Undeleteflag Option

Introduced in release: 8.0.1

When the  Message Store boolean option is set, it causes imapd to set an explicit    message flag when the   flag is removed. This feature allows clients to detect when a previously deleted message is no longer deleted, which can be helpful when providing a gateway to a protocol that has to treat this scenario as if a new message arrived. The  message flag has no additional special semantics and may be set or cleared by clients if the IMAP ACL on the mailbox permits flag changes.

The default value is: 0

See also:
 * Message Store options