I am using this workaround - I only have 70 clients.  Have the primary email for every client set to an email domain/server that is not using spamcop (try your own personal email, a company email  account, etc.) . If you find a domain which you control and which gets the intuit emails, using Outlook you can forward email from "client 1" to the correct email address for "client 1" using the "rules" feature of Outlook..  The rule says "forward all email containing the string "client 1" to the email address for "client 1", all email containing the string "client 2" to "client 2", etc..  So your personal or corporate email domain/server becomes an intermediate server.  The original IP address for intuit does not appear as the "received from" address in the forwarded email so spam blockers will only prevent the email if your own IP address is on the list of blocked IP addresses which it probably isn't.