The secure management of attachments is described. In one example, a message is received by a device management computing environment from a client computing device. The message can include an addressee list, a resource locator to a file, and a schedule associated with an event, for example. The message is intended for distribution to a number of other client devices along with the file according to the addressee list. However, the file is not directly attached to the message. Instead, the distribution of and access to the file is managed separately and securely by the device management computing environment. The device management computing environment can cause the file to be accessible through the client devices using the resource locator based on the schedule associated with the event. Further, after the event, the device management computing environment can cause the file to be inaccessible and/or removed from the client devices.