mailability

• a word derived from mail.
  mail

  noun

  letters, packages, etc., that are sent or delivered by means of a postal system.
• a word derived from mailable.
  mailable

  adjective

  legally acceptable as mail, as in terms of content, size, or weight.

More Suggestions

• malleability
• habitability
• navigability
• affability
• capability
• disability
• drivability
• friability
• inability