Commonly used in business correspondence to indicate additional documents are shipped separately. The signed contract will arrive under separate cover for your records.
Pro Tip 2/3
Professional Tone
Using 'under separate cover' adds a professional, formal tone to communication. Please find the quotation enclosed, with samples to follow under separate cover.
Pro Tip 3/3
Mailing Privacy
Used when sensitive information needs to be sent discretely or in isolation for confidentiality. Your medical records will be sent to you under separate cover for privacy reasons.