class Net::IMAP::ResponseCode

Net::IMAP::ResponseCode represents response codes. Response codes can be retrieved from ResponseText#code and can be included in any “condition” response: any TaggedResponse and UntaggedResponse when the response type is a “condition” (“OK”, “NO”, “BAD”, “PREAUTH”, or “BYE”).

Some response codes come with additional data which will be parsed by Net::IMAP. Others return nil for data, but are used as a machine-readable annotation for the human-readable ResponseText#text in the same response. When Net::IMAP does not know how to parse response code text, data returns the unparsed string.

Untagged response code data is pushed directly onto Net::IMAP#responses, keyed by name, unless it is removed by the command that generated it. Use Net::IMAP#add_response_handler to view tagged response codes for command methods that do not return their TaggedResponse.

IMAP extensions may define new codes and the data that comes with them. The IANA IMAP Response Codes registry has links to specifications for all standard response codes. Response codes are backwards compatible: Servers are allowed to send new response codes even if the client has not enabled the extension that defines them. When unknown response code data is encountered, data will return an unparsed string.

See [IMAP4rev1] §7.1, “Server Responses - Status Responses” for full definitions of the basic set of IMAP4rev1 response codes:

• ALERT, the ResponseText#text contains a special alert that MUST be brought to the user’s attention.

• BADCHARSET, data will be an array of charset strings, or nil.

• CAPABILITY, data will be an array of capability strings.

• PARSE, the ResponseText#text presents an error parsing a message’s [RFC5322] or [MIME-IMB] headers.

• PERMANENTFLAGS, followed by an array of flags. System flags will be symbols, and keyword flags will be strings. See System flags at Net::IMAP

• READ-ONLY, the mailbox was selected read-only, or changed to read-only

• READ-WRITE, the mailbox was selected read-write, or changed to read-write

• TRYCREATE, when append or copy fail because the target mailbox doesn’t exist.

• UIDNEXT, data is an Integer, the next UID value of the mailbox. See [IMAP4rev1], §2.3.1.1, “Unique Identifier (UID) Message Attribute.

• UIDVALIDITY, data is an Integer, the UID validity value of the mailbox See [IMAP4rev1], §2.3.1.1, “Unique Identifier (UID) Message Attribute.

• UNSEEN, data is an Integer, the number of messages which do not have the \Seen flag set.

See RFC5530, “IMAP Response Codes” for the definition of the following response codes, which are all machine-readable annotations for the human-readable ResponseText#text, and have nil data of their own:

• UNAVAILABLE

• AUTHENTICATIONFAILED

• AUTHORIZATIONFAILED

• EXPIRED

• PRIVACYREQUIRED

• CONTACTADMIN

• NOPERM

• INUSE

• EXPUNGEISSUED

• CORRUPTION

• SERVERBUG

• CLIENTBUG

• CANNOT

• LIMIT

• OVERQUOTA

• ALREADYEXISTS

• NONEXISTENT