关于qmail-scanner的出错日志，帮忙分析

lushy

Aug  7 04:40:32 lushuangyin smtpd: 1123360832.084309 Malformed UTF-8 character (overflow at 0x5468de09, byte 0xcf, after start byte 0xbf) in pattern match (m//) at /var/qmail/bin/qmail-scanner-queue.pl line 681, <STDIN> line 20.
Aug  7 04:40:32 lushuangyin smtpd: 1123360832.084382 Malformed UTF-8 character (overflow at 0x5468de09, byte 0xcf, after start byte 0xbf) in pattern match (m//) at /var/qmail/bin/qmail-scanner-queue.pl line 681, <STDIN> line 20.
Aug  7 04:40:32 lushuangyin smtpd: 1123360832.084426 Malformed UTF-8 character (overflow at 0x5468de09, byte 0xcf, after start byte 0xbf) in pattern match (m//) at /var/qmail/bin/qmail-scanner-queue.pl line 681, <STDIN> line 20.
Aug  7 04:40:32 lushuangyin smtpd: 1123360832.084499 Malformed UTF-8 character (overflow at 0x5468de09, byte 0xcf, after start byte 0xbf) in pattern match (m//) at /var/qmail/bin/qmail-scanner-queue.pl line 2093, <STDIN> line 20.
Aug  7 04:40:32 lushuangyin smtpd: 1123360832.084567 Malformed UTF-8 character (overflow at 0x5468de09, byte 0xcf, after start byte 0xbf) in pattern match (m//) at /var/qmail/bin/qmail-scanner-queue.pl line 2093, <STDIN> line 20.
Aug  7 04:40:32 lushuangyin smtpd: 1123360832.084655 Malformed UTF-8 character (overflow at 0x5468de09, byte 0xcf, after start byte 0xbf) in pattern match (m//) at /var/qmail/bin/qmail-scanner-queue.pl line 2093, <STDIN> line 20.
Aug  7 04:40:32 lushuangyin smtpd: 1123360832.084741 Malformed UTF-8 character (overflow at 0x5468de09, byte 0xcf, after start byte 0xbf) in pattern match (m//) at /var/qmail/bin/qmail-scanner-queue.pl line 2098, <STDIN> line 20.
Aug  7 04:40:32 lushuangyin smtpd: 1123360832.084786 Malformed UTF-8 character (overflow at 0x5468de09, byte 0xcf, after start byte 0xbf) in pattern match (m//) at /var/qmail/bin/qmail-scanner-queue.pl line 2103, <STDIN> line 20.