Google has some tools to help debug, which I have experimented with.
I consider having less than 100% reliability to be a reason to find another solution. I started with SendGrid. Google was a substantial improvement. My financial resources are limited, and do not extend to a commercial ISP account. So I have to run this in "the cloud". I choose Google's cloud for various reasons. They both forbid and block any attempt to operate an MTA. I assume other cloud vendors do too. Since I cannot run my own MTA I feel a bit stuck.
Currently I am running a small web site and a modest mailman3 implementation in Google's cloud for less than $25/month, including the cost of the Google Workspace account that lets me use their SMTP relay. Any suggestions on more reliable ways of implementing mailman3 that do not dramatically expand the budget are most welcome.
Thanks!
On Sun, Sep 28, 2025 at 11:32 AM Stephen J. Turnbull <steve@turnbull.jp> wrote:
tom@tomsmyth.ca writes:
Are folks still using Google Workspace or Sendgrid for Mailman?
No, but I did until May. I stopped because I wasn't actually using that Mailman instance for anything. As far as I know nothing has changed.
For Sendgrid, don't all sending addresses have to be verified?
Yes.
How do you get around that?
Basic answer, you don't. I used the approach of setting DMARC mitigation to Munge From for all outgoing mail.
I'm not sure that's entirely necessary. I seem to recall that there are documented ways to use Sendgrid to pass through mail with a different From if you set Sender or maybe the envelope From_. But it seemed annoying. Almost all traffic was from me anyway, so it didn't really matter to me. Munge From was easy (by default it even sets Reply-To appropriately for my use case).
I'm currently using a Linode for my mail server. I looked at Google cloud but it didn't seem to have any advantages over Linode, and I was already familiar with Linode. The only problem was Spamhaus had my IPv6 listed, and if you don't pay for the address you effectively get a /128 network from Linode. Spamhaus flat refuses to help in that case. So I configured Postfix to use only IPv4 for outgoing mail and that's working fine for me so far (but small amount of traffic).
-- GNU Mailman consultant (installation, migration, customization) Sirius Open Source https://www.siriusopensource.com/ Software systems consulting in Europe, North America, and Japan
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