Подскажите куда копать.
Jul 4 14:12:01 freepbx postfix/pickup[18249]: BC7858223672: uid=0 from=<root>
Jul 4 14:12:01 freepbx postfix/cleanup[18278]: BC7858223672: message-id=<20210704091201.BC7858223672@freepbx.mydomain.ru>
Jul 4 14:12:01 freepbx postfix/qmgr[18250]: BC7858223672: from=<root@freepbx.mydomain.ru>, size=473, nrcpt=1 (queue active)
Jul 4 14:12:01 freepbx postfix/smtp[18280]: BC7858223672: to=<xx@mydomain.ru>, relay=192.168.xx.xxx[192.168.xx.xxx]:587, delay=0.07, delays=0.03/0.02/0.02/0, dsn=5.7.1, status=bounced (host 192.168.xx.xxx[192.168.xx.xxx] said: 550 5.7.1 Authentication Required (in reply to MAIL FROM command))
Jul 4 14:12:01 freepbx postfix/cleanup[18278]: CDBAB8223673: message-id=<20210704091201.CDBAB8223673@freepbx.mydomain.ru>
Jul 4 14:12:01 freepbx postfix/bounce[18282]: BC7858223672: sender non-delivery notification: CDBAB8223673
Jul 4 14:12:01 freepbx postfix/qmgr[18250]: CDBAB8223673: from=<>, size=2398, nrcpt=1 (queue active)
Jul 4 14:12:01 freepbx postfix/qmgr[18250]: BC7858223672: removed
Jul 4 14:12:01 freepbx postfix/local[18283]: CDBAB8223673: to=<root@freepbx.mydomain.ru>, relay=local, delay=0.01, delays=0/0.01/0/0, dsn=2.0.0, status=sent (delivered to mailbox)
Jul 4 14:12:01 freepbx postfix/qmgr[18250]: CDBAB8223673: removed