As everyone is aware, forwarded jokes, etc. are a major source of SPAM addresses.
It would be a simple matter for the email client producers, Microsoft, Google, Yahoo, Mozilla et al. to add a "Send to Friends"
button. This would remove recipient addresses from the original and put the recipient list into the BCC: field.
How can we persuade mail client providers to offer this?
PS: It would also be nice if the app could check to see if an attached video was available on YouTube. The user would be notified and could then substitute the link instead of forwarding the (often massive) attachment.

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