Email server test

I configure my mail server, but keep getting “AxiosError: Request failed with status code 400 to help you.”

I do have an email address for the admin user; the server works, I tested with telnet. I configured the mail server so that authentication was not needed. I did set a timeout of 30. It seems as though it is not hitting my mail server.

Any suggestions as to where to look?

Using AIO, [Nextcloud Hub 9 (30.0.9), Using PHP 8.3.19

I just searched for that error message and found

I am getting the key to small error in the log file. However, I am using lets encrypt on the mail server, a keysize of 2048 bit, and configured the mail server not to require authentication from the IP address.

And yes, the admin account does have an email address configured.