The SEC began allowing the use of electronic signatures in 2001. It amended the books and records rule to permit electronic record keeping. Beyond this, there hasn’t been much guidance from regulators regarding the use of e-signatures.
If you decide to go the e-signature route, be sure that you have specific policies in place as to who in the firm can use the process, for what documents, and what types of clients. Include in your process how you will verify the signature. In addition, you should keep written confirmation from the client that they intend to use e-signatures.