iCloud email won't send? Here's what to check to fix it

iCloud has restrictions that could prevent your email from being sent.

- GLENN FLEISHMAN

Email may seem quaint to some people, but billions upon billions of messages are sent that way every day. (Some of them we even want to receive!) Apple's iCloud service includes an email address and the ability to send and receive email. But you may occasionally be stymied when you're sending a message and you don't get enough detail in an error message to know why iCloud rejected it.

Here are the most common reasons: