How to stop my emails to be sent as bulk email?

I have a reason to do that.

I 开发者_高级运维have recorded a voice message, attached with email, and sent it to several companies. One company, takes that voice message/email, and send it to millions of people.

I want to stop resend of my email/voice recording.

I am C# develop, one of my client asked me this question. I asked him to introduce verification codes, so that nobody will be able to listen the voice but still emails would be sent to millions of poeple.

Any workaround for this problem?

Host your audio file on a website, then provide a link to that audio file in your emails. That way all your emails are light-weight and are not clogging people's inboxes.

Once someone has a recording of your voice, there isn't anything you can do to stop them from sending it to whoever they want.