PeekMode Property
When set to True, the message Seen flag is not changed during reading.
Syntax
public var peekMode: Bool {
get {...}
set {...} }
Default Value
False
Remarks
This property contains a true or false to determine whether or not this message should be seen. When this property is set to True, a "PEEK" option is added to all IMAP FETCH commands sent to the server. An RFC compliant IMAP server should not set the "Seen" flag on the message in this case.