I often get an error message when I try to send an attachment using Windows Live Mail.  The attachment may only be 1.5MB or 2MB. 

The exact message from a pop windows says " The message could not be sent.  There is not enough memory."

I don't know why i receive this message.  Sometimes I am able to send emails with a 5-6MB attachment and sometimes I can't send one with a 1.5MB attachment.  The error does not occur all the time but it occurs very often.

What could be the issue?

I am running Windows 7 64 bit running Windows Live Mail Version 2012 (Build 16.4.3508.0205).  I have plenty of memory installed (8GB) on my PC.

(Moved from Windows | Windows 7 | Email and Communications)