Mine

Oct 18 11:59:20 chrisnux postfix/smtpd[4750]: < unknown[67.15.25.10]: ehlo server5
Oct 18 11:59:20 chrisnux postfix/smtpd[4750]: > unknown[67.15.25.10]: 250-chrisnux.office
Oct 18 11:59:20 chrisnux postfix/smtpd[4750]: > unknown[67.15.25.10]: 250-PIPELINING
Oct 18 11:59:20 chrisnux postfix/smtpd[4750]: > unknown[67.15.25.10]: 250-SIZE 10240000
Oct 18 11:59:20 chrisnux postfix/smtpd[4750]: > unknown[67.15.25.10]: 250-VRFY
Oct 18 11:59:20 chrisnux postfix/smtpd[4750]: > unknown[67.15.25.10]: 250-ETRN
Oct 18 11:59:20 chrisnux postfix/smtpd[4750]: match_list_match: unknown: no match
Oct 18 11:59:20 chrisnux postfix/smtpd[4750]: match_list_match: 67.15.25.10: no match
Oct 18 11:59:20 chrisnux postfix/smtpd[4750]: > unknown[67.15.25.10]: 250-AUTH DIGEST-MD5 LOGIN CRAM-MD5 PLAIN
Oct 18 11:59:20 chrisnux postfix/smtpd[4750]: > unknown[67.15.25.10]: 250 8BITMIME
Oct 18 11:59:20 chrisnux postfix/smtpd[4750]: watchdog_pat: 0x8d5c750
Oct 18 11:59:44 chrisnux postfix/smtpd[4750]: < unknown[67.15.25.10]: auth plain AGluZm9AY2xpZW50Lm9mZmljZQB6eGN2YjMyMQ==
Oct 18 11:59:44 chrisnux postfix/smtpd[4750]: smtpd_sasl_authenticate: sasl_method plain, init_response AGluZm9AY2xpZW50Lm9mZmljZQB6eGN2YjMyMQ==
Oct 18 11:59:44 chrisnux postfix/smtpd[4750]: smtpd_sasl_authenticate: decoded initial response
Oct 18 11:59:44 chrisnux postfix/smtpd[4750]: warning: SASL authentication failure: Password verification failed
Oct 18 11:59:44 chrisnux postfix/smtpd[4750]: warning: unknown[67.15.25.10]: SASL plain authentication failed
Oct 18 11:59:44 chrisnux postfix/smtpd[4750]: > unknown[67.15.25.10]: 535 Error: authentication failed
Oct 18 11:59:44 chrisnux postfix/smtpd[4750]: watchdog_pat: 0x8d5c750