When I send e-mail messages to other Mac users, the e-mails stay consistent with font.  However, when I send to a PC user running e-mail on aol, the font sizes sometimes get changed.  It seems as though the sizes change when new information is typed or copied into a message.  My e-mail is running on outlook 2011 - a POP Account.  My Outlook preferences are set to Arial 13 for outgoing messages, but it is being changed to larger sizes when sent to this particular person...Any thoughts?  Thx