utf-8-ify stdout if locale env indicates utf8; Mail::IMAPTalk returns errormessages with the leading 'BAD' or 'NO' removed; adapt summary generation to Mail::IMAPTalk; unmime headers in summary;

use Mail::IMAPTalk instead of Mail::IMAPClient

check whether actually an error occured when the search result is undef; check $@ for that (instead of $imap->LastError); distinguish warnings from error messages

use folderlist from @ARGV only if @ARGV actually contains at least one foldername

folderlist is supposed to be an array ref

[perltidy]

added TODO