Connected to localhost.
Escape character is '^]'.
220 sakura.nwug.org ESMTP Postfix (20110603)
helo ch2.cc
250 sakura.nwug.org
mail from: xxxxxx@xxx.xxx
250 2.1.0 Ok
rcpt to: 9@ch2.cc
250 2.1.5 Ok
rcpt to: <9@ch2.cc>
250 2.1.5 Ok
rcpt to: <'9@ch2.cc'>
501 5.1.3 Bad recipient address syntax
rcpt to: '<9@ch2.cc>'
501 5.1.3 Bad recipient address syntax
rcpt to: 9@ch2.cc
250 2.1.5 Ok

結論 <'mail@address'> みたいに ‘ シングルクオートで囲うのはダメ。
つか、なんで、そんな風にアドレス登録するのよ？