Photos and Gmail

I have this recurring problem with gmail. My father occasionally sends photos to my gmail address and my work address in the same mail. I use Eudora at work. At work I can get the pictures fine but from gmail the files are corrupt somehow. If I download the attached file from gmail the jpg cannot be viewed. I sister and wife have the same problems with pics through gmail from dad. I can send attachments via gmail to myself fine. It is strange any ideas?