How to compress photo files small enough to email.

What version of iPhoto are you using?

When you select the Photos and use the Share ➙ Mail feature

you'll get this window where you can select the file size of the files you're sending;

When you get to the Mail composition window the size of the attachments will be seen above the first image:

This was for the Small setting for 3 images that totaled 6.2 MB.

Hi, What size images are you trying to send?

What size images CAN you send? How many MB ?

When sending an image, you have the option to set Image Size as Small Medium or Large

See this thread

The total attachment size exceeds the 25MB limit