After manually sending email i can receive email.
Command:
root@RR-DE-NMS-1:/etc# echo "Test mail from postfix" | mail -s "Test Postfix" sazzad.hussein@de.rr-icecream.eu
Log:
Apr 9 08:46:41 RR-DE-NMS-1 postfix/smtp[8203]: 8E466D20A54: to=<sazzad.hussein@de.rr-icecream.eu>, relay=172.19.1.31[172.19.1.31]:25, delay=0.11, delays=0.01/0/0/0.1, dsn=2.6.0, status=sent (250 2.6.0 <20150409064641.8E466D20A54@RR-DE-NMS-1.de.rr-icecream.internal> Queued mail for delivery)
Apr 9 08:46:41 RR-DE-NMS-1 postfix/qmgr[1305]: 8E466D20A54: removed
But NAGIOS isn't sending automatic email when any device got up/down. Please check the log. Its been sending alert to root@xxxx. I have checked the Aliases. Nothing is there in Aliases file.
Log:
Apr 9 08:40:02 RR-DE-NMS-1 postfix/pickup[1303]: 1AB1DD20A54: uid=108 from=<smmsp>
Apr 9 08:40:02 RR-DE-NMS-1 postfix/cleanup[8067]: 1AB1DD20A54: message-id=<20150409064002.1AB1DD20A54@RR-DE-NMS-1.de.rr-icecream.internal>
Apr 9 08:40:02 RR-DE-NMS-1 postfix/qmgr[1305]: 1AB1DD20A54: from=<smmsp@de.rr-icecream.internal>, size=756, nrcpt=1 (queue active)
Apr 9 08:40:02 RR-DE-NMS-1 postfix/smtp[8069]: 1AB1DD20A54: to=<root@de.rr-icecream.internal>, orig_to=<root>, relay=172.19.1.31[172.19.1.31]:25, delay=0.34, delays=0.09/0.08/0/0.16, dsn=2.6.0, status=sent (250 2.6.0 <20150409064002.1AB1DD20A54@RR-DE-NMS-1.de.rr-icecream.internal> Queued mail for delivery)
Apr 9 08:40:02 RR-DE-NMS-1 postfix/qmgr[1305]: 1AB1DD20A54: removed
Apr 9 08:46:41 RR-DE-NMS-1 postfix/pickup[1303]: 8E466D20A54: uid=0 from=<root>
Apr 9 08:46:41 RR-DE-NMS-1 postfix/cleanup[8201]: 8E466D20A54: message-id=<20150409064641.8E466D20A54@RR-DE-NMS-1.de.rr-icecream.internal>
root@RR-DE-NMS-1:/etc# ls -lrt aliases
-rw-r--r-- 1 root root 0 Apr 7 11:29 aliases
root@RR-DE-NMS-1:/etc# more aliases
root@RR-DE-NMS-1:/etc#