Re: [exim] Running our own email server on GCP

Jasen Betts via Exim-users <exim-users@???> writes:

> On 2022-01-04, Byung-Hee HWANG via Exim-users <exim-users@???> wrote:
>> Terrance Devor via Exim-users <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.
>>
> I suspect they block outbound to 25 to prevent complaints that their
> address range is in spamhaus DUL

It is keen insight!

Sincerely, Byung-Hee