Even if I'm inside the box itself & send emails to myself, it was not received too (despite that sending to external emails including gmail was Ok) :
# mailx -s "tst to localhost" myunixid@localhost < /etc/hosts
# mailx -s "tst to myportaltech" myuni...@myportaltech.com < /etc/hosts
# mailx -s "tst to hostname" myunixid@`hostname` < /etc/hosts
# mailx -s "tst to local private IP" myunixid@private_IP_addr < /etc/hosts
# su - myunixid
$ mailq
/var/spool/mqueue is empty
Total requests: 0
