“Attach” the photo to your email before sending. Your email program has settings you can control that specify how an attachment is handled. Please check the documentation for your specific program.
It may be helpful to compress the file before attaching.
Use a compression program e.g., DropStuff, WinZip or StuffIt.
(Google “compression software” for more choices and instructions)
Keep in mind how your photo will be used. For Print or Web?
For printed material, send the largest possible photo file. At least 1 MB.
For Web site use, no need for large files. Under 1MB in size is fine.
Anything above 300 ppi is still considered high-res, but you'd say it like this:
“I made a 600ppi -High Res scan.”
Tip: If you are using a photo sharing program, as a rule of thumb, the more files you add to an email via digital imaging software i.e. Kodak Easy Share, the smaller the files will be. The software “sizes” or “compresses” the files to best travel over the Internet, in the same email.