When sending attachments to my dad, he often claims that there's nothing to open. However, copies I send to myself at my home/work Outlook and Yahoo accounts have the attachments as I intended. He uses Outlook Express, and I'm not sure if there's a setting that he needs to tweak, or if his ISP blocks attachments for some reason. The blocked attachments range from .jpg's to .txt files, and they're not large (< 300kb). Any suggestions? Thanks in advance.