First time setup Nagios 4 on Centos 7 with Postfix for sending alert emails. My local domain is example_1.com my exchange mailbox mx record is example_2.com, and both behind firewall on the same network.
When sending email through Postfix from nagios@example1.com to user@example_2.com, I keep getting
Name service error for name=example_2.com type=A: Host found but no data record of requested type.
I suspect it is DNS misconfiguration in Postfix. How do I resolve this issue? Please advice. Much appreciated.
Please see below for my /postfix/main.cf
myhostname = HostName.example_1.com
mydomain = example_1.com
myorigin = $mydomain
inet_interfaces = all
inet_protocals = ipv4
mydestination = $myhostname, localhost.$mydomain,localhost, $mydomain
mynetworks = 127.0.0.0/8, 10.1.176.0/23
alias_maps = hash:/etc/aliases
alias_database = hash:/etc/aliases
home_mailbox = Maildir/
smtpd_sasl_type = dovecot
smtpd_sasl_path = private/auth
smtpd_sasl_auth_enable = yes
smtpd_sasl_security_options = noanonymous
smtpd_sasl_local_domain = $myhostname
smtpd_recipient_restrictions = permit_mynetworks,permit_auth_destination, permit_sasl_authenticated,reject
Error message:
Mar 4 17:41:40 HostName postfix/smtp[13576]: 4D5232232A50: to=<user@example_2.com>, relay=none, delay=0.03, delays=0.02/0/0/0, dsn=5.4.4, status=bounced (Host or domain name not found. Name service error for name=example_2.com type=A: Host found but no data record of requested type)