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If you have Microsoft PowerPoint, you can put all your pictures on there and then save that as one file, and upload it and send it. Simple as that. Although, this will only work if your recipients all have Microsoft PowerPoint.
If not, all you have to do is use a photo sharing site and upload your pictures to that, most of them these days all have options where you can view the pictures as a slide show.
Good luck.

If you have Microsoft PowerPoint, you can put all your pictures on there and then save that as one file, and upload it and send it. Simple as that. Although, this will only work if your recipients all have Microsoft PowerPoint.
If not, all you have to do is use a photo sharing site and upload your pictures to that, most of them these days all have options where you can view the pictures as a slide show.
Good luck.
References :
Personal Experience.
Here’s some photo sharing sites.
http://www.snapfish.com/
http://www.photosite.com/
http://photobucket.com/
http://www.shutterfly.com/
http://www.flickr.com/
http://www.webshots.com/
http://www.smugmug.com/
Hopefully, this helped you out.