How come I can't email my photos from my camera roll on iphone? It does allow me to send via text

This was actually the most useful answer.

To anyone having this issue: Make sure only ONE mail is turned on. For my case, I had a yahoo and Gmail account's "Mail" turned on both at once - it automatically turns them on if you ever create both. Simply only have one account with mail turned on.

My assumption is that once one has both turned on, it doesn't know which account to send mail from, or it tries to send from both at once and seizes up.