Because his e-dog kept chasing the e-postman.
Someone who lays awake at night, wondering if there is a dog.
You would call it a dog. A dog wearing a watch is not a watchdog.
When there are no attachments
Because your foot would go right through the computer screen!
In a henvelope!
We're raising mashed potatoes.
Because the letters can't go anywhere by themselves.
He wanted to check his e-mail.