When the noun email means “a message sent by email,” the plural form is emails:
- I received 10 emails (or messages) yesterday.
When there is no mention of number, email is used in the singular form as a mass (or uncountable) noun:
- I received email yesterday.
The confusion about the use of the plural form emails likely arises because mail (delivered by Canada Post) is a mass noun and thus has no plural form:
- Jack received mail—one magazine, two bills and one postcard.
OR
- Jack received four pieces of mail.
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