It is no surprise that your actual voice mail greeting must be delivered in the same way: Professional, clear, brief, and to the point. In a previous blog, "Marketing Messages on Your Cell Say You Mean Business," some techniques for making a professional voice mail greeting were discussed. There are many similarities between leaving a voice mail, and producing a voice mail greeting. You want your callers and receivers to hear a confident and professional person on the other end delivering a coherent message. You should introduce yourself to a prospective client in a personal way. An email doesn't generate much discussion, nor does it necessarily show you went the extra mile in contacting the client. Generating conversation. A professional, well conveyed voice message shows the voice mail receiver that you are confident and well-spoken, and that there is a person behind the message. Emails can be prepared, edited, and revised unlike voice mail messages An email or email chain thread is documentation of a conversation that can easily be referenced In an email you can include a phone number, address, website, etc that may be hard to remember or record through voice mail communication Emails can be forwarded, CC'ed, and blasted.
You can allow callers to press 0 and be transferred to another phone number, of your choosing, when they reach your voicemail greeting.

It seems we never run out of ways to embarrass ourselves these days. Yes, almost all of us are guilty of leaving voicemails which should NOT have been listened to..
Check with your carrier on specifics, but an option to "send a message" may be in the voicemail menu. This will allow you to send a voice message from your voicemail to another person's inbox without having to make a phone call first.