String - The initial word from the server response.

GetResponse is a reintroduced string function in TIdIMAP4 that implements retrieval and processing of IMAP4 server responses. GetResponse is used to read and accumulate response lines from the remote IMAP4 server until a line that has a valid response that terminates the response. 

GetResponse handles server response that include the following: 

• Simple tagged responses

  C41 OK Completed

• Untagged responses followed by a tagged response:

  * LIST (UnMarked) "/" INBOX
  * LIST (UnMarked) "/" Junk
  * LIST (UnMarked) "/" Junk/Subbox1
  C42 OK Completed

• Untagged success or failure reponses:

  * OK CommuniGate Pro IMAP Server 3.5.7 ready

• Untagged message literals:

  + Send the additional command text

• Completion responses:

  OK - search completed
  NO - search error: can't search that [CHARSET] or criteria
  BAD - command unknown or arguments invalid

Because you may get data first, which you need to skip, you need to accept all the above possibilities. 

We MUST stop when we find a valid response code, like OK. 

GetResponse sets the formatted reply in LastCmdResult using the initial tagged or completion response accumulated from the server.

GetInternalResponse LastCmdResult