It’s also easier than resizing them before sending.
On the Ribbon grab the Insert tab and click Attach File.
Windows Explorer opens up.
Select and double choose the picture you want to send in your email.
*Note: you’re able to also drag and drop the picture into your email message.
In the Picture Options section, you could resize the attached picture automatically to one of the pre-set sizes.
Notice especially the checkbox for “Show when attaching files”.
As picture files can get quite large this allows you to send them as a reasonable sized attachment.