Send icon disappeared from MAIL toolbar
In MAIL, the toolbar displays the usual Get Mail, Forward, etc. icons but the Send icon disappeared. It's not in "Customize Toolbar" either. I can select Message - Send, but it's more convenient to have the Send icon on the toolbar. Any idea where it went, and how I can get it back? I Quit MAIL and re-launched it, but that didn't help.
iMac (27-inch Mid 2011), Mac OS X (10.6.8)