Setting up another email address for a different domain and the email wasn’t getting received. I looked in the cyberpanel email log and found this message:
Our system has detected that 550-5.7.1 this message does not meet IPv6 sending guidelines regarding PTR 550-5.7.1 records and authentication. Please review 550-5.7.1
I went in to cyberpanel, and selected to “list emails” and selected the new domain. There was a message there which said:
SSL for email is not configured properly, you may get Self-Signed error on mail clients such as Outlook and Thunderbird. More details here.
And it linked to this page.
There was also a link labeled “Fix Now” which I clicked and that seems to have fixed the problem.
Update 7/1/2022 – I was getting similar but slightly different error messages showing up and I no longer have the option to just click “fix now”, so I went through some other troubleshooting and seem to have it fixed. At least for now. Here was my solution to emails not being forwarded to gmail accounts through cyberpanel.