Hey,
For the longest time the mail send feature not working in Nextclou AIO. Now I had some time to play with it, but I couldn’t solve the issue.
The error:
AxiosError: Request failed with status code 400
smtp.google.com:465
credentials: my.email.adress WITHOUT gmail.com and an app password generated from google.
I’m on Nextcloud AIO v10.10.0.