Google Compute Engine firewall example

Outbound SMTP connections are blocked by the Google Compute Engin, but there is no problem for incoming. To allow default SMTP port 25

$ gcloud compute firewall-rules create rulesmtp --allow tcp:25
Created [https://www.googleapis.com/compute/v1/projects/i88.ca:cloud-sqll/global/firewalls/rulesmtp].
NAME     NETWORK SRC_RANGES RULES  SRC_TAGS TARGET_TAGS
rulesmtp default 0.0.0.0/0  tcp:25

$ telnet 188.188.188.188 25
Trying 188.188.188.188...
Connected to 188.188.188.188.
Escape character is '^]'.
220 example.c.cloud-sqll.i88.ca.internal ESMTP Postfix (Ubuntu)

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