Hi,
TMail21 is a SaaS solution that can support many types of processes. It can support both internal as well as external processes and in particular it can also support approval processes.<p>Additionally it supports characteristics like Certified Mail, guaranteed delivery, non-spoofable identities, non-repudiable audit trails etc. which make it perfect for this kind of problem.<p>You can learn more at <a href="https:&#x2F;&#x2F;tmail21.com" rel="nofollow">https:&#x2F;&#x2F;tmail21.com</a>. This next link specifically talks about characteristics related to security, identity, non-repudiability, certified mail etc.
<a href="https:&#x2F;&#x2F;tmail21.com&#x2F;why-tmail&#x2F;mission-critical-processes&#x2F;" rel="nofollow">https:&#x2F;&#x2F;tmail21.com&#x2F;why-tmail&#x2F;mission-critical-processes&#x2F;</a>