cannot e-mail picture from iPhoto to my e-mail account?

Hello,

I am using Comcast as my e-mail carrier. When I go into iphoto and select photos I want to e-mail to myself, I can do this function and it appears that it works

correctly. It says e-mail has been sent. However, I cannot get any of these e-mails in my Comcast mailbox on my Mac. I know they are being sent because I can get them on my iPhone.

Everything else appers to be working correctly. I can send e-mails to myself. I just cannot received them with a photo attached.

Any ideas?