I am using paypal buttons created with the paypal Button creation tool. The button is embedded in an html email, sent to a user.
If I open the email in its native email program (yahoo, gmail, etc.) - the button redirects to the correct page and payment can be made.
If I open the email in Apple Mail, the button takes me to the login screen, or my account if I happen to be logged in.
I've checked to make sure I have copied the button EXACTLY, just not sure why the behavior is different or if there is anything I can do to ensure the right redirection behavior.