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Why do intended recipients turn red if they are not already in the address book?

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When I select "Write" and start to type an intended recipient in the "To" box it turns red if the recipient is not already in my address book. I assume that this means I cannot send an email to anybody not already in my address book.

When I select "Write" and start to type an intended recipient in the "To" box it turns red if the recipient is not already in my address book. I assume that this means I cannot send an email to anybody not already in my address book.

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No it means they are not in your address book. Did you bother trying to send the message? If it is a legitimate email address it will work just fine.

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Chosen Solution

No it means they are not in your address book. Did you bother trying to send the message? If it is a legitimate email address it will work just fine.

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Many thanks for the quick and helpful response, which solves my problem.