1. A method for facilitating electronic signatures on a client device operated by a signer, comprising in the client device: importing, by the client device, documents obtained from an email client of the client device into a remote electronic signature service, by: receiving an electronic signature document; in response to an input received from the signer, causing the received electronic signature document to be stored at the remote electronic signature service; providing access to the electronic signature document stored at the remote electronic signature service; and causing an electronic signature of the signer to be stored in association with the electronic signature document stored at the remote electronic signature service; wherein the electronic signature document is initially received by the email client, wherein the input received from the signer is received via a user interface of the email client, as modified by a plug-in module of the email client, wherein causing the received electronic signature document to be stored includes transmitting, by the plug-in module, the received electronic signature document to the remote electronic signature service, where the electronic signature document is converted into a standard format, and wherein providing access to the electronic signature document includes automatically causing, by the plug-in module, the electronic signature document to be displayed in a Web browser of the client device, such that the signer can review, modify, and sign the electronic signature document, and further comprising: after causing the electronic signature of the signer to be stored in association with the electronic signature document, automatically causing, by the plug-in module, the email client to prepare an outgoing email message that includes an attached file that represents the electronic signature document including the electronic signature of the signer.
9. The method of claim 1 , further comprising installing a code module on the client device, the code module configured to perform the importing documents obtained from the email client of the client device into the remote electronic signature service.