I have a couple of services that have email notification features that I want to enable and use. I don’t want to have to pay for external relay services. I wish to use port 25 but port 25 is blocked by default. How do I request a review of my GCP project to see if Google will lift the port 25 egress restriction? Does anyone have any experience going through this process?
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Hello @David_Miles ,
By default you can’t request such review (maybe there is an option with TAM / Technical Account Manager, if you are a Google Partner, but such partners are not using SMTP on 25 ;)). SMTP 25 port is blocked by default and unblocked also automatically, if you met this condition: Google Cloud automatically removes this block once it determines a project is at low risk of sending large volumes of email over unencrypted connections.
If you need SMTP, you have to use TLS with port 465 or 587. For sure, if you just created new project, SMTP 25 will be blocked.
cheers,
Damian | GDE for Google Cloud