From what I have read, there is a big mix of Sent Folder names (Sent, Sent Mail, Sent Folder, Sent Items, Sent Messages, etc.). Is there an universal name, i.e. "/sent" that IMAP will always use correctly regardless of server or client names?
As it follows from the IMAP4 standard, the case-insensitive mailbox name INBOX is a special name reserved to mean "the primary mailbox for this user on this server". The interpretation of all other names is implementation-dependent. See RFC3501 (https://tools.ietf.org/html/rfc3501
) for more details.
You can get a list of available folder names using the GetMailBoxes method. The other method, GetSubscribedMailBoxes, returns a list of subscribed folders.