How do you apply and release a legal hold on email and messaging without breaking normal disposition?

A legal hold (also called a litigation hold or preservation hold) suspends the destruction of records that may be relevant to anticipated or active litigation, audit, or investigation. The goal is narrow: protect what is potentially relevant without freezing your entire records program. Email and messaging make this harder because content is high-volume, distributed across mailboxes and chat platforms, and often disposed of on short, automated schedules.

The core principle: hold overrides disposition, not the other way around

A properly designed program treats the hold as a layer that sits on top of normal retention. When a record is subject to both a retention schedule and an active hold, the hold wins: disposition is paused for that specific content until the hold is released. Everything not in scope continues to age out and dispose on schedule. This keeps your program defensible and prevents over-retention, which itself creates cost and risk.

Applying a hold

• Define scope precisely. Identify custodians, date ranges, accounts, and the messaging platforms involved (email, chat, ephemeral or collaboration tools). Document the trigger and the reasoning.
• Issue a written notice. Tell custodians what to preserve and to stop deleting in-scope material. Track acknowledgments.
• Suspend automated deletion in place. Apply preservation at the system level so auto-delete, mailbox quotas, and retention rules do not purge in-scope items. Avoid relying on individuals to manually copy or move messages.
• Capture the full record. For messaging, preserve threading, participants, timestamps, attachments, and edits or reactions where the platform supports them.

Releasing a hold

• Confirm the matter is closed and that no other hold still applies to the same content. Custodians and records frequently overlap multiple matters, so check before lifting.
• Document the release with date and authority, mirroring the discipline used to apply it.
• Return content to normal disposition. Once released and no longer relevant to any matter, items resume their retention schedule and become eligible for disposition again.

Keep the audit trail

Defensibility comes from documentation. Record who issued, modified, and released each hold, what was in scope, and when normal disposition resumed. Coordinate closely with legal counsel and records staff throughout.

For related guidance, see the email and messaging topic hub.