Hi!
Welcome to YT. I have a resizing program that came on my 'puter, but Diego posted the following link yesterday. Hope it's a good one.
http://www.resize2mail.com/
Also, under the MY YORKIE section, at the top, Admin has posted info for posting pics and resizing pics using Irfanview. Hope this helps. If you still have problems, just "holler for help" because lots of people on here will be glad to help you.