How to Email a Photo with a Mac
I don't have an Apple but you could try this link for help on sending a full resolution photo without condensing the file size.
How to Email a Photo in Outlook
Emailing a photo will often reduce the size automatically. Using the Add File feature will send the photo in the same manner as a document and will not condense the file size.
Start your email
Select Add file
Go to Library, Pictures, or wherever your photos are stored and click on the one you want.
Email to firstname.lastname@example.org.
Digital Art from Photos Surrey BC Canada
Pixel Pixie Photopainting