Solved| Postfix Error, "No Route To Host", on CentOS 6.5 installed on VMware Workstation

Hello all,

I’ve installed virtualmin on a CentOS 6.5, which is installed on a VMware Workstation.

I’ve created a virtual server and configured it.

After all, I’ve tried to send an e-mail, from an address I created on that virtual server, but it didn’t work.

When I try to reach error logs,

cat /var/log/maillog

Apr 30 17:45:45 myhostname postfix/smtp[43370]: connect to gmail-smtp-in.l.google.com[173.194.65.26]:25: No route to host
Apr 30 17:45:45 myhostname postfix/smtp[43370]: connect to alt1.gmail-smtp-in.l.google.com[74.125.25.26]:25: No route to host
Apr 30 17:45:45 myhostname postfix/smtp[43370]: connect to alt2.gmail-smtp-in.l.google.com[173.194.64.26]:25: No route to host
Apr 30 17:45:45 myhostname postfix/smtp[43370]: connect to alt3.gmail-smtp-in.l.google.com[74.125.142.27]:25: No route to host
Apr 30 17:45:45 myhostname postfix/smtp[43370]: connect to alt4.gmail-smtp-in.l.google.com[74.125.137.27]:25: No route to host
Apr 30 17:45:45 myhostname postfix/smtp[43370]: 57D731A0446: to=anothermail@gmail.com, relay=none, delay=3356, delays=3355/0.01/0.48/0, dsn=4.4.1, status=deferred (connect to alt4.gmail-smtp-in.l.google.com[74.125.137.27]:25: No route to host)
Apr 30 17:45:56 myhostname postfix/postsuper[43382]: 57D731A0446: requeued
Apr 30 17:45:56 myhostname postfix/postsuper[43382]: Requeued: 1 message

When I try to reach via telnet from another computer, I cannot connect to port 25 too.

What should I do?

Thanks for your kind help.

The source of problem is ISP. They’ve closed port 25. Pushed them to open it. Now it works.