Some users can email reports directly from Navision and some cannot. What needs to be done so that users can use this function? 2009 R2

Some users can email reports directly from Navision and some cannot. What needs to be done so that users can use this function? 2009 R2
Is there a document emailing solution embedded with specific user licensing? Do users get errors when trying?
You could look to bypass this by using one of the options mentioned in this blog: cloudblogs.microsoft.com/.../