If you are sending an email to the assigned user, and recording this in CRM (by email amanager) Then you can create a view that looks at the leads communications and if the reminder hasn't been sent then send it. The view does all the conditional checking as a row will only appear if no communication is found and you can thus have an unconditional escalation rule.

If you are sending an email to the assigned user, and recording this in CRM (by email amanager) Then you can create a view that looks at the leads communications and if the reminder hasn't been sent then send it. The view does all the conditional checking as a row will only appear if no communication is found and you can thus have an unconditional escalation rule.

Could also pin a report to the dashboard of Leads without Communications on them. (this is actually my preferred method as then users aren't getting lots of emails which they could just end up ignoring anyway)

The report could be of Leads assigned to the user which have no communications. So highlighting that they need to do something with them. From the dashboard they can go into the record and/or update its position in the Workflow as well.