On 2022-01-04, Byung-Hee HWANG via Exim-users wrote:
> Terrance Devor via Exim-users writes:
>
>> I have read that google blocks port 25 and 465. We absolutely need to run
>> our email own email servers on GCP using our Kubernetes cluster. Did anyone
>> succeed in this?
>
> Currently i am running Postfix on GCP, Ubuntu 18.04 LTS as Google
> Computer Engine. You can open INGRESS (port 25 inbond). However you
> cannot open ENGRESS (port 25 outbond). So you should use outside SMTP
> for sending. In my experience, Mailgun and Amazon SES are good for
> sending. They offer special ports such as 2525, 2587 for relaying.
>
> Sicerely, Byung-Hee
I suspect they block outbound to 25 to prevent complaints that their
address range is in spamhaus DUL
--
Jasen.
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