Sending encrypted email

Is it possible to send an encrypted email to a person who you have had no correspondence or contact with beforehand, so that only that person will be able to decrypt and read the message?

Basically, if a business has a new client and they want to send the client an encrypted email, is it possible? Or does the client need to set something up first of all?

I am looking at this from two possible points of view:
1. Sending from an email client - e.g Outlook or Outlook Express.
2. Sending the email from a web site.

I have a client who has the following requirement:
"Security of e-mails and other documents.... the truth is that all of my e-mails sent and received need to be secure as they will often carry personal data."

What would you tell them? Thanks.

 

 

 

 

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