くだらない質問はここに書き込め!なんでもアリ22

[0610 名無しさん＠お腹いっぱい。 NG NG]

from = "From:" mailbox-list CRLF
mailbox-list = (mailbox *("," mailbox)) / obs-mbox-list
mailbox = name-addr / addr-spec
name-addr = [display-name] angle-addr
display-name = phrase
phrase = 1*word / obs-phrase
word = atom / quoted-string

だから囲う必要なし。