I travel quite a bit and I belong to an amateur digital photo club in the village where I live.

I have always included pictures in my emails from the various places but have now found that one or two members think it is ok to reprint my pictures.

How can I simply protect my pictures without falling out with some of these people.

Thankful for any advice.

Rather than email images to people setup an online gallery and point your email correspondents to that resource.

Put a watermark on your images to make it clear that these images are your property and not free for all.

If you can't trust the people not to reprint, then stop providing full-sized copies of your shots. 640x480 for example would produce a fine image on screen but be next to useless for printing. Then do as Grinder suggests and set up an online gallery where people can order prints.