Email problems troubleshooting

[JK]

Hello,

I'm using Easysoft 8.01, and a easy-e4-dc-12TC1 upgraded to firmware 1.42

I couldn't get email working, so I decided to setup a fake SMTP server to see what's going on.

My findings:

ESMTP ("EHLO") support is required from the smtp server.

Even with "Connection security: not encrypted" configured, easye4 will disconnect from the mail server if STARTTLS is not supported.

Even with empty username and password configured, easye4 will disconnect from the mail server if authentication is not supported.

If server supports, for example AUTH PLAIN, and empty username and empty password is configured on easye4, easye4 attempts to authenticate with empty strings, which confuses some smtp servers.
If server supports for example AUTH LOGIN, and empty username and empty password is configured, easye4 disconnects when it's time to send auth data. (Maybe it crashes?).


So in summary, to me it seems like:

Server must support STARTTLS
Server must support Authentication.
Empty username/password not allowed.