- For Gmail, Hotmail and many others you have to select STARTTLS under Connection Type in ContaCam's Email Send Configuration dialog.
- If 2-Step verification is OFF then usually it necessary to allow Less secure app access in the security page of your account.
- If 2-Step verification is ON then usually it necessary to create an App password in the security page of your account to be used instead of your normal password.
- Sometimes it's also necessary to enable POP/IMAP/SMTP access under the settings of your web email page.
Note: if it says something like "Please log in with your web browser and then try again" then you probably tried too much. That's a security measure of free email providers, so do exactly what is says, login to the web email interface and confirm that it was you.
Example configuration for Gmail