Meenakshi, I'm afraid that suggestion is completely inadequate.
Every recipient is unique and mostly a one-off - think of the workflow you are suggesting. Simply not practical!
But even more important . . . you are providing a service (at a fee) to send documents to people for signature and your email server has been flagged as having a high spam rating. It is your responsibility to clear your spam score so that the service you are providing actually works.
If all echosign emails end up in spam it makes your service pointless and useless.