How to Setup a Mailserver on Google Cloud VM

email-servergoogle-cloud-platformUbuntu

I want to know how to setup a mail server like postfix on Google VP instance.

I'm running Ubuntu 16.04 (and LAMP stack) and can't get the mail server to send email from website.

I have installed postfix, and opened port 25, but no luck.

Any ideas on how to proceed?

Error logs: Network is unreachable and Connection timed out

Best Answer

According to https://cloud.google.com/compute/docs/tutorials/sending-mail/, you cannot set up a mail server the usual way, as ports 25, 465 and 587 are blocked for outbound connections on Google Cloud. Instead, you might take a look at relaying services such as Mailgun or SendGrid, which allow sending through port 2525 or an API instead. These services might cost a little bit of money, however.

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I agree that it is likely to be anti-spam techniques used by google :

Here's the telnet output from another IP :


> telnet gmail-smtp-in.l.google.com 25
Trying 173.194.70.26...
Connected to gmail-smtp-in.l.google.com.
Escape character is '^]'.
220 mx.google.com ESMTP j49si145368071eep.45
quit
221 2.0.0 closing connection j49si145368071eep.45
Connection closed by foreign host.

And the same telnet for the ip you mention :


> telnet 74.125.39.27 25
Trying 74.125.39.27...
telnet: connect to address 74.125.39.27: Operation timed out
telnet: Unable to connect to remote host

Best Answer

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