1. In the Camera Roll: tap the Forwarding button
2. Tap to on the photos to select then tap Copy
3. In Mail: Tap and hold down in the message area of the email. When the Magnifier Lens appears, release and tap Paste.

You can send upto 5 photos using the Share button but for more than 5, use copy and paste. An advantage of copy and paste is that this method will send the original sized image and avoid the photo resizing problem.

Note: There is a limit to the total size of the attachment sent by the iPhone 3G of 5MB. So if the photos are all taken at full resolution 1600x1200, it is likely that you will not be able to send more than 5 photos because the sixth photo would make the attachment greater than 5MB.

I described how to send just one original size photo on this post:

http://neilboyd.co.uk/how-to-posterous-full-size-image-from-iphone

Sent from my iPhone

Sent from my iPhone

Update Note:

This was my first experiment sending iPhone app images from the iPhone to Posterous. What I learnt:

1. If you send an image from the Camera Roll using the Share button, the image may be resized either up or down from the original size, depending the size and image type of the original.

2. If the image is a PNG screen capture it is *not* resized. e.g. Corkboard by Catalypstwo - Pick from Today

3. If it is a JPG image saved by an app or camera to the Camera Roll, it is resized to 800px high even when the original is 480px high. e.g. this Monkey Island Montage image and Color Converter App