** \e$B%Q%$%W%U%)%k%@$K!"?75,%a!<%k%A%'%C%/;~$K%@%&%s%m!<%I$^$G$d$C$F$7$^$&\e(B
\e$B%*%W%7%g%s$r@_$1$k\e(B
** rfc2192, rfc2193, rfc2221 (imap referral \e$B$N=hM}\e(B) \e$B$X$NBP1~\e(B
** \e$B%Q%$%W%U%)%k%@$K!"?75,%a!<%k%A%'%C%/;~$K%@%&%s%m!<%I$^$G$d$C$F$7$^$&\e(B
\e$B%*%W%7%g%s$r@_$1$k\e(B
** rfc2192, rfc2193, rfc2221 (imap referral \e$B$N=hM}\e(B) \e$B$X$NBP1~\e(B