DocuShare does not provide credentials when sending email, the solution provided below is a work around to this issue.
Note: This solution applies to DocuShare 4.x, 5.x and 6.0.x, and 6.1.x Only. This does not apply to DocuShare 6.5.x and higher.
Is There A 20 Email Address Limit on the Number of External Recipients in a Subscription?
Change Recipients Button Is Missing From Notifications After Upgrade
Duplicate Email Notifications are Being Received