Hi, Robert -
I'm probably going to be restating the obvious here, but I'm a bit confused and need some more information to try to help.
I just sent a few photo's to someone and they
couldn't see them, Subsequently asking me to send
them again in jpeg format,
You seem to be differentiating between photos and JPEGs. As since85 stated above, some photo apps save in proprietary formats. What photo app are you using? If it's not iPhoto then what file-type suffix does the file have? (You may need to go into the actual folder on your hard drive where the app stores its files, if the application hides the suffix by default.)
The only time any of my photo's appear as jpeg files
is as source in iphoto files or if they've been
modified and dragged to the desk top, even then they
sometimes appear as originals instead of modified,
cropped usually and when appearing as a jpeg file
always open into a photo when dragged into an email.
Down loading to a frequent website also has them
appearing as jpeg's if they appeared as jpegs on my
desk top, but as photo's when appearing as photo's on
my desk top.
One thought that just occurred to me - when you say that the file "opens", rather than appearing as a file; are you saying that, when you try to drag-and-drop an image file into Mail's message pane, the photo app that you use is activated onscreen, or that what appears in the Mail message pane is the image itself, rather than the file's desktop icon with the filename, size, etc.?
If the photo app is opening whenever you touch a JPEG, then you might need to go to that applications Preferences pane and see if there is an option to select/de-select that says something like "Always open file-type "xxx" with application "yyy".
If you are confused by Mal dropping the visible image into the message pane, rather than just a marker saying that there is an image file attached, then that's just a matter of getting used to Mail's methods. At work I use a web-based mail program that has a separate section at the top of the screen that tells me that a file is attached; at home i use Mail which inserts the visible image into the message itself.
So it appears to me that there are two issues:
1 - that the recipient possibly couldn't open a proprietary file-type and;
2 - that rather than showing a file icon (possibly because Mail doesn't recognize the file-type as an image file, either), Mail is inserting the visible JPEG image (which it DOES) recognize) into the message pane.
Of course, all of my assumptions could be completly off the mark, here, which is why I'm restating in hopes of clarification; I never claimed to be the brightest guy in the room!
A third possibility, if it's not a proprietary fle-type, and it's not Mail's actions, is that the file is getting corrupted in transit, or is losing one of the parts of the file. Historically, Mac files have had two parts - a "Data Fork", where the actual information is stored, and a "Resource Fork" which tells the system what KIND of a file it is. (This is why, for years, Mac users laughed at Windows users who actually had to use those ",zzz" file suffixes to tell their computers what kind of a file they had. On Macs, it was all hidden.) In any case; it sometimes happens that, as a file goes through the network, the Resource Fork information (which not all systems recognize as valid data) gets lost or corrupted, making the file unreadable by anyone. Compressing the files into, say, a .ZIP archive using an app like Stuffit will generally prevent this file corruption from happening (and will present the archived file's icon in the message pane, rather than the image data, if that was what was going on).
If any of this makes sense, let me know; if I'm totally wrong in my assumptions, then let me know as well, and let's see if we can clarify where I'm wrong and get you sorted out.
Mike Moyle
Mac OS X (10.4.6)