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[root@server ~]# tail /var/log/maillog
Jan 28 20:11:08 server postfix/smtpd[5150]: disconnect from 181-161-155-199.baf.movistar.cl[181.161.155.199]
Jan 28 20:11:19 server postfix/smtpd[5150]: connect from 181-161-155-199.baf.movistar.cl[181.161.155.199]
Jan 28 20:11:19 server postfix/smtpd[5150]: NOQUEUE: reject: RCPT from 181-161-155-199.baf.movistar.cl[181.161.155.199]: 554 5.7.1 <mi_correo@gmail.com>: Relay access denied; from=<usuario_legitimo@dominio.cl> to=<mi_correo@gmail.com> proto=ESMTP helo=<[192.168.1.43]>
Jan 28 20:11:22 server postfix/smtpd[5150]: disconnect from 181-161-155-199.baf.movistar.cl[181.161.155.199]
Jan 28 20:13:37 server postfix/postfix-script[5176]: stopping the Postfix mail system
Jan 28 20:13:37 server postfix/master[5146]: terminating on signal 15
Jan 28 20:13:42 server dovecot: master: Warning: Killed with signal 15 (by pid=5185 uid=0 code=kill)
Jan 28 20:13:42 server dovecot: imap: Server shutting down. bytes=239/1128
Jan 28 20:13:42 server dovecot: imap: Server shutting down. bytes=120/464
Jan 28 20:13:42 server dovecot: imap: Server shutting down. bytes=509/2325
[root@server ~]#
Los ultimos logs es porque apagué el servicio mientras tanto.