Gets the ordinal message number of the first message which does not have "\Seen" flag set.
The integer value containing one-based message number of the first unseen message in the currently selected folder, or 0 if there are no unseen messages in the folder or no folder is selected.
Messages are flagged with "\Seen" tag when they are downloaded completely. For instance, if only a header section of an unseen message is downloaded, the message will remain unseen. When the message is downloaded entirely, it will be flagged "\Seen".
Note If the folder was selected in read-only mode (e.g. using ExamineFolder method), the message flags will NOT be affected under any circumstances.
Imap Class | MailBee.ImapMail Namespace