emailing a larger set (15-20) of photos If I need to send a set of 15 photo images via email, what is the best way to do this? Will I need to send them in multiple emails? I understand that I should resize the files to 72 dpi.
For sharing photos, you can use iCloud Photo sharing. For more information, refer to the Apple support document, iCloud Photo Sharing.

If the recipient are not using Apple devices, they can still access the photos via iCloud website.