I just wanted to share with you an error that he left me, for times when they might occur
I tell them that I could not send mail and did not know why, went out this error
[root@serverchat ~]# cd /var/log
[root@serverchat log]# tail -f 200 maillog
Sep 6 16:55:52 serverchat sm-msp-queue[3681]: t85GwX9P031926: to=xxxxx@gmail.com, ctladdr=apache (48/48), delay=1+04:57:19, xdelay=00:00:00, mailer=relay, pri=2640334, relay=[127.0.0.1], dsn=4.0.0, stat=Deferred: Connection refused by [127.0.0.1]
Sep 6 16:55:53 serverchat sm-msp-queue[3681]: t85H0fiE031947: to=xxxxx@bsconsultores.com.pe, ctladdr=apache (48/48), delay=1+04:55:12, xdelay=00:00:00, mailer=relay, pri=2640342, relay=[127.0.0.1], dsn=4.0.0, stat=Deferred: Connection refused by [127.0.0.1]
SOLUTION
# vi /etc/sysconfig/selinux
change
SELINUX=enforcing to SELINUX=disabled
# init 6