- For most email providers you have to select STARTTLS under Connection Type in ContaCam's Email Send Configuration dialog.
- For Gmail and some other free email providers create an App Password in the security page of your email account to be used instead of your account password, Gmail explains it here.
- Sometimes it's also necessary to enable POP/IMAP/SMTP access under the settings page of your email account.
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