You may receive this automatic reply after sending an email. This message tells you that your email wasn't sent to the intended recipient because the spam filter thinks it is a spam email.
This email starts with "this is the mail system at host mail.webador.com" and looks like this:
You can flag this as incorrect so the spam filter won't block future emails you send.
Click on the link at the bottom of the email.
On this page, click on the orange Not Spam button.
Try sending your email again. It won't take effect immediately, but it will ensure that the spam filter starts learning how to process your emails.