Email notification won't send (Postfix)

[hr7]

HI, I've been trying to send an email notification to gmail or even other email address but it won't send. The web interface has shown that it has send the email. I take a look at the postfix mail log and below are the error. I'm using CentOs 7 and Nagios 4.3.1

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Apr  8 23:36:52 localhost postfix/pickup[19717]: 822B86642A0: uid=1001 from=<nagios>
Apr  8 23:36:52 localhost postfix/cleanup[20014]: 822B86642A0: message-id=<20170408153652.822B86642A0@localhost.localdomain>
Apr  8 23:36:52 localhost postfix/qmgr[19718]: 822B86642A0: from=<nagios@localdomain.localdomain>, size=736, nrcpt=1 (queue active)
Apr  8 23:36:52 localhost postfix/error[20016]: 822B86642A0: to=<example@gmail.com>, relay=none, delay=0.06, delays=0.04/0.01/0/0.01, dsn=4.4.1, status=deferred (delivery temporarily suspended: connect to alt2.gmail-smtp-in.l.google.com[74.125.30.26]:25: Connection timed out)

and here are the postfix configuration.

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myhostname = localhost.localdomain
mydomain = localdomain
myorigin = $mydomain
inet_interfaces = all
mydestination = $myhostname, localhost, $mydomain
mynetworks = 127.0.0.0/8, 192.168.1.0/24
relay_domains = $mydestination

my mail path and command.cfg lines.

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/usr/bin/mail

# 'notify-host-by-email' command definition
define command{
	command_name	notify-host-by-email
	command_line	/usr/bin/printf "%b" "***** Nagios *****\n\nNotification Type: $NOTIFICATIONTYPE$\nHost: $HOSTNAME$\nState: $HOSTSTATE$\nAddress: $HOSTADDRESS$\nInfo: $HOSTOUTPUT$\n\nDate/Time: $LONGDATETIME$\n" | /usr/bin/mail -s "** $NOTIFICATIONTYPE$ Host Alert: $HOSTNAME$ is $HOSTSTATE$ **" $CONTACTEMAIL$
	}

# 'notify-service-by-email' command definition
define command{
	command_name	notify-service-by-email
	command_line	/usr/bin/printf "%b" "***** Nagios *****\n\nNotification Type: $NOTIFICATIONTYPE$\n\nService: $SERVICEDESC$\nHost: $HOSTALIAS$\nAddress: $HOSTADDRESS$\nState: $SERVICESTATE$\n\nDate/Time: $LONGDATETIME$\n\nAdditional Info:\n\n$SERVICEOUTPUT$\n" | /usr/bin/mail -s "** $NOTIFICATIONTYPE$ Service Alert: $HOSTALIAS$/$SERVICEDESC$ is $SERVICESTATE$ **" $CONTACTEMAIL$
	}

Please point out my mistake. I've been trying to send an email for 3 days. Your help is highly appreciated.

[avandemore]

This is the issue:

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(delivery temporarily suspended: connect to alt2.gmail-smtp-in.l.google.com[74.125.30.26]:25: Connection timed out)

From my terminal:

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# telnet 74.125.30.26 25
Trying 74.125.30.26...
Connected to 74.125.30.26.
Escape character is '^]'.
220 mx.google.com ESMTP g10si1087889otc.146 - gsmtp

So there is some type of networking issue afoot.

[hr7]

This is the issue:

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(delivery temporarily suspended: connect to alt2.gmail-smtp-in.l.google.com[74.125.30.26]:25: Connection timed out)

From my terminal:

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# telnet 74.125.30.26 25
Trying 74.125.30.26...
Connected to 74.125.30.26.
Escape character is '^]'.
220 mx.google.com ESMTP g10si1087889otc.146 - gsmtp

So there is some type of networking issue afoot.

Is it because of the firewall? how do I fix it? I already put my network on main.cf file but it's not working.

[dwhitfield]

This is not really a Nagios question, but if you post the output of traceroute 74.125.30.26, it may be obvious. You may have to install traceroute first. yum install traceroute in your case