Yes, we are doing it via images which are hosted on our server securely encrypted. We offer 3 different sending modes: - tracking only -> the email can't be mo

Yes, we are doing it via images which are hosted on our server securely encrypted. We offer 3 different sending modes: - tracking only -> the email can't be modified after sending but you get a notification when the recipient opens the mail - attachments only -> you can not modify the emails content but you can modify / remove attachments - full unsend -> you can modify / remove contents of the emails after its been sent / opened + same for attachments