A RELEASE action automatically removes held messages. RELEASE removes all messages (both original and supplemental) associated with the identifier specified in the action. This action is ignored if no held messages are associated with the identifier. RELEASE actions in a pattern are executed before all HOLD actions in the pattern.

See 4.2 for formatting information. The action-text is a 1- to 12-character identifier previously specified in a HOLD action. See 4.13.