Hao

Just double checked and we are using RSA for signing key here, https://github.com/juanfont/headscale/issues/2446, but still not working.

@xet7 I tested https://learn.microsoft.com/en-us/azure/communication-services/, and AWS SES has to be URL-encoded for the `password` section. It seems if the URL is not encoded, it will pop up saying the URL...

For Azure Email service, there is `.` or `|` in user name, which may also need to be encoded. I can give it a test tomorrow.

Tested with encoded `|`, still got the error: ``` Sending email failed Error trying to send email: xxxxx:error:1408F10B:SSL routines:ssl3_get_record:wrong version number:../deps/openssl/openssl/ssl/record/ssl3_record.c:332: ``` Update: It worked after using `smtp` instead of...