I select photos to email at full size, but actual email reduces their size to around 400KB. Why won’t it send at full size?

2 situations:  If I email a photo from Photoshop Lightroom, the windows live window appears.  In the lower left corner is a preset dropdown to select the quality.  I select Full Size.  But when email goes the recipient receives a 400KB size file, instead of the 10 mb FILE.  Why DOES THE RECIPIENT not  get a full size?  2nd case, attaching a photo to an email message, results the same.Thanks for your help to set preferences in Skymail.