tomb wrote:
Jun 13 15:33:42 mail1 postfix/smtpd[7867]: xsasl_dovecot_server_first: sasl_method PLAIN, init_response <deleted pwd>
Jun 13 15:33:42 mail1 postfix/smtpd[7867]: xsasl_dovecot_handle_reply: auth reply: OK?1?user=domainadmin@somedomain.com
Jun 13 15:33:42 mail1 postfix/smtpd[7867]: > unknown[10.2.1.198]: 235 2.7.0 Authentication successful
SMTP authentication is ok.
Any related log in Dovecot log file? Maybe you need to turn on debug mode in Dovecot to track it.