Nov 11 21:21:23 mail postfix/submission/smtpd[23694]: connect from unknown[2600:3c00::f03c:91ff:fe97:79b4]
Nov 11 21:21:23 mail postfix/submission/smtpd[23694]: Anonymous TLS connection established from unknown[2600:3c00::f03c:91ff:fe97:79b4]: TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)
Nov 11 21:21:28 mail postfix/submission/smtpd[23694]: warning: unknown[2600:3c00::f03c:91ff:fe97:79b4]: SASL PLAIN authentication failed:
Nov 11 21:21:28 mail postfix/submission/smtpd[23694]: lost connection after AUTH from unknown[2600:3c00::f03c:91ff:fe97:79b4]
Nov 11 21:21:28 mail postfix/submission/smtpd[23694]: disconnect from unknown[2600:3c00::f03c:91ff:fe97:79b4] ehlo=2 starttls=1 auth=0/1 commands=3/4