How to resolve this error, help I
Feb 3 20:29:14 security postfix/smtpd[2286]: connect from mail-it0-f51.google.com[209.85.214.51]
Feb 3 20:29:14 security postfix/smtpd[2286]: 965B110A12: client=mail-it0-f51.google.com[209.85.214.51]
Feb 3 20:29:14 security postfix/cleanup[2325]: 965B110A12: message-id=<8d1621f3ee8bd7220f8131efb95500cd@www.xxxxxx.com.br>
Feb 3 20:29:14 security postfix/qmgr[2188]: 965B110A12: from=<bxxxxxxxx@gmail.com>, size=12506, nrcpt=1 (queue active)
Feb 3 20:29:14 security postfix/smtpd[2286]: disconnect from mail-it0-f51.google.com[209.85.214.51] ehlo=1 mail=1 rcpt=1 data=1 quit=1 commands=5
Feb 3 20:29:14 security postfix/lmtp[2326]: 965B110A12: to=<adrianxxo@xxxxxxxx.com.br>, relay=127.0.0.1[127.0.0.1]:10024, delay=0.2, delays=0.15/0/0.04/0, dsn=5.6.7, status=bounced (SMTPUTF8 is required, but was not offered by host 127.0.0.1[127.0.0.1])
Feb 3 20:29:14 security postfix/qmgr[2188]: 965B110A12: removed
Feb 3 20:29:14 security postfix/smtpd[2286]: connect from mail-it0-f51.google.com[209.85.214.51]
Feb 3 20:29:14 security postfix/smtpd[2286]: 965B110A12: client=mail-it0-f51.google.com[209.85.214.51]
Feb 3 20:29:14 security postfix/cleanup[2325]: 965B110A12: message-id=<8d1621f3ee8bd7220f8131efb95500cd@www.xxxxxx.com.br>
Feb 3 20:29:14 security postfix/qmgr[2188]: 965B110A12: from=<bxxxxxxxx@gmail.com>, size=12506, nrcpt=1 (queue active)
Feb 3 20:29:14 security postfix/smtpd[2286]: disconnect from mail-it0-f51.google.com[209.85.214.51] ehlo=1 mail=1 rcpt=1 data=1 quit=1 commands=5
Feb 3 20:29:14 security postfix/lmtp[2326]: 965B110A12: to=<adrianxxo@xxxxxxxx.com.br>, relay=127.0.0.1[127.0.0.1]:10024, delay=0.2, delays=0.15/0/0.04/0, dsn=5.6.7, status=bounced (SMTPUTF8 is required, but was not offered by host 127.0.0.1[127.0.0.1])
Feb 3 20:29:14 security postfix/qmgr[2188]: 965B110A12: removed