Links in the internet chain between you and you friend may be stripping off the attachment, though 1.2MB does not sound large enough for that. In my experience, about 5MB is a good, general (self imposed) maximum limit and beyond about 10MB is in the "probably not going to make it" category.
The easy solution: upload it to free Dropbox or similar space, get a link to the file and email the link. They can then download the image from the link (even without installing/using Dropbox themselves). This will also work with your iPhone or iPad test too. If you use some other cloud space, you can likely do the same with just about any of them.
After you know they have it, delete it to free up the cloud space.