First, for your relationships with clients and external parties, select your electronic signature provider and stop printing useless papers! Preferably, find a provider who is qualified as a “certified third party provider”. This label ensures that they have implemented secured identification processes that comply with applicable requirements for valid electronic signatures (you can investigate with Hellosign, Docusign, Yousign, etc).
Second, in France you can agree on an evidence agreement with your partners to limit future discussions on this particular topic (special agreement or directly in your bylaws). This kind of agreement will clearly state that you all agree on the validity and the reliability of the electronic signature used to secure your relationship.
So stop hesitating, stop killing trees and try now electronic signature!
If you have experience in this field, you can share it with us!