Abstract: Systems and methods for providing e-mail to a mobile client are disclosed. In one example, the method can include receiving, at a server associated with transmitting e-mail to the mobile client, an indication of a battery level in the mobile client. The method can also include comparing the battery level to a threshold level and synchronizing e-mail with the mobile client when the battery level meets the threshold level. The method can further include activating, when the battery level is below the threshold level, a filtered mode for synchronizing e-mail with the mobile client, the filtered mode transmitting fewer than all of the available e-mail messages for the mobile client.