Hello @james and @robi
Thank you for your follow-ups. I will try to clarify.
My Cloudron doesn't accept incoming emails from Google/Gmail. The e-mail bounces back to Google (Gmail) instead of being delivered.
I included the n8n logs, as they were done on a workflow I have setup using the Gmail node, and where I set both a Gmail and my Cloudron instance as recipients. The mail was received by my Gmail account, but was undelivered to my Cloudron box.
I will try to simplify: Mail sent from Gmail times out - it never reaches my Cloudron box at all.
Yesterday evening, I was able to test sending e-mails from Live (Microsoft) and Proton to my Cloudron box, and both of these go through. So it seems it is only mail from Gmail that my Cloudron box refuses to accept.
The "extra weird" thing is that, for my outgoing e-mails, I use Google's servers as outgoing SMTP. Despite this, e-mails sent with my Cloudron box are received by the Cloudron box, but not when they are sent from a Google account (this applies both to e-mails sent from Google's Gmail service and from Google hosted Workspace accounts).
It seems something on my Cloudron box is refusing to accept mail sent from Google.
Is there a way to reset Cloudron's spam filter training? For testing purposes, I have already disabled Spamhouse (Mail ACL), and there are 0 addresses on the blocklist in my spam filtering.
Thank you very much for providing assistance!