imapError and imfError cases had too much complexity for PostalError. So I moved them as internal types and duplicate their cases in PostalError. For future, the protocol PostalErrorType will help us to maintain internal types and the conversion IMAPError/IMFError -> PostalError.
imapErrorandimfErrorcases had too much complexity forPostalError. So I moved them as internal types and duplicate their cases inPostalError. For future, the protocolPostalErrorTypewill help us to maintain internal types and the conversionIMAPError/IMFError->PostalError.