HTC Hero :: Photos Emailed Using Share Don't Arrive

This is my first post on here - I tried looking for an existing thread that might answer my question, but couldn't find one.Although generally happy with my HTC Hero, one problem I'm having is that I can't seem to email photos.Say I'm looking through my photos and want to email one, I press 'Menu', then 'Share', then 'Google Mail' then enter the email address and then press 'send'. It then says 'Sending message', albeit only briefly. (I would've thought it would take longer to email a 5MB photo and that the 'Sending message' notification would stay up for as long as the email was in the process of being sent.) But there's no indication of whether the email has arrived or not. Well, it hasn't. I've tried different photos, different email addresses. but none of the photos emailed using the 'share' funtion have arrived with the intended recipient.Same with the Sticky Note app. There's an option to email the sticky note, but despite numerous attempts, none of them have arrived at the recipient's email address.