Is It Mail or Mails?
The Noun Mail Can Be Countable or Uncountable. in More General, Commonly Used, Contexts, the Plural Form Will Also Be Mail. However, in More Specific Contexts...
The noun mail can be countable or uncountable. In more general, commonly used, contexts, the plural form will also be mail. However, in more specific contexts, the plural form can also be mails e.g. in reference to various types of mails or a collection of mails.
Is it correct to say mails?
The plural form of e-mail is, indeed, e-mails, even though there's no corresponding plural of mail as mails. This mismatch has rankled seekers of grammatical consistency over the years, but it has nonetheless settled into standard usage. First some terminology.
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Does mail have a plural form?
Email is the plural form of email, much like mail is the plural form of mail, when discussing email in a general sense.