Forwarded email lines

I'm using Yahoo for email and I frequently forward emails, but the forwarded email has blue lines on the left side of the message. How do I delete them?

The "blue lines" indicate that you aren't really forwarding the mail, but quoting it in a new reply.

The way to avoid this is to actually use the "forward" button:



I just tested this to make sure I was giving you the correct advice, and the message came to my regular email address without the quote indicators.