I was just giving details for relaying through Google smtp server.
Thanks for the description of how to relay e-mail through SMTP, but it does not address the original problem. It was not clear in the original message that I do know how to do this, but as I asked, are you actually using this? I can't authenticate. You addressed the "authentication" question, in an inconsistent manner. The "GMail" credentials are not the same as an "AppPassword", and I see no authentication in SMTP but "GMail" credentials. It appears that SMTP relay through Google is only available for "Google Workspaces" customers, unless somebody knows something I don't.
I guess you are relaying through someone else?
Actually, no. I have not found a suitable "host". I am "relaying through my own "Mail.Tryx.org". This is usually a fine solution, but I should really be sending my logs through a service with 100% uptime, and I have to bring Zimbra down for daily backups, at a minimum. Webhosting is pretty cheap, but I can probably simply time the Zimbra e-mail backup such that it is completes before anything else starts, and be done with it. Only conflict would be a process that takes longer than 24 hours to complete, and that is also a problem, but a different problem.