My project up and beta running on google compute engine. I want to set-up email server. For that i followed http://www.krizna.com/centos/setup-mail-server-in-centos-6/

I edited /etc/postfix/main.cf exactley how they mentioned and here is few more details

myhostname = mx.audiworld.com
mydomain = audiworld.com
mynetworks = <compute-instance-ip>,

when I issue telnet localhost 25 I am getting below error

[root@myinstance-1 ~]# telnet localhost 25
Trying ::1...
telnet: connect to address ::1: Connection refused
telnet: connect to address Connection refused

but namp localhost gives me

Starting Nmap 6.40 ( http://nmap.org ) at 2014-11-06 09:48 UTC
Nmap scan report for localhost (
Host is up (0.000011s latency).
Other addresses for localhost (not scanned):
Not shown: 992 closed ports
21/tcp  open  ftp
22/tcp  open  ssh
80/tcp  open  http
110/tcp open  pop3
143/tcp open  imap
465/tcp open  smtps
993/tcp open  imaps
995/tcp open  pop3s

Nmap done: 1 IP address (1 host up) scanned in 2.42 seconds

so the smtp port is 465 right ? then telnet localhost 465 finally got it working

Ok this what google is telling

Google Compute Engine does not allow outbound connections on ports 25, 465, and 587 but you can still set up your instances to send mail through ports 587 and 465 using servers provided through partner services, such as SendGrid. This document discusses how to set up your instances to send email using SendGrid.

but I don't want sendgrid to manage email . without using sendgrid how to setup Email server.?

closed as off-topic by Ladadadada, Michael Hampton Nov 7 '14 at 4:06

  • This question does not appear to be about server, networking, or related infrastructure administration within the scope defined in the help center.
If this question can be reworded to fit the rules in the help center, please edit the question.

  • Is Postfix running? Check the inet_interfaces directive. netstat -tlnp is better than nmap for finding what is listening on your local box. – Ladadadada Nov 6 '14 at 10:30
  • @Ladadadada thanks! i given netstat -tlnp oh .. there i can't see postfix in PID/Program name what should i do ? – user252626 Nov 6 '14 at 10:32
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    @Ladadadada: There is no point in getting postfix to run if you can't the mail away from your system. – Sven Nov 6 '14 at 10:34
  • @rajasimon: Postfix doesn't have a process called postfix. There are master,qmgr,tslmgr,pickup and maybe others, depending on your config. – Sven Nov 6 '14 at 10:35
  • i can see two master there tcp 0 0* LISTEN 5493/master – user252626 Nov 6 '14 at 10:40

You can't. The text is clear: Google Compute Engine does not allow outbound connections on ports 25, 465, and 587.

If that doesn't work for you, you are on the wrong platform.

  • I don't want to depend on another email hosting platform like sendgrid. All i want to in google compute engine itself or is there any other way around that ? – user252626 Nov 6 '14 at 10:43
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    There is no way around that. If you don't like the restrictions Google put on their Compute Engine product, don't use it. It's as simple as that. – Sven Nov 6 '14 at 10:44
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    Note that you can use any service that offers non-standard ports. These days, port 2525 is becoming quite popular among 3rd party MTA providers. – mensi Feb 17 '15 at 14:51