It's cheap. One can also block a domain. Review collected by and hosted on G2.com.
It doesn't catch emails that are obviously phishing attempts. Some of the subjects of emails AppRiver hasn't caught:
Alert: Update Your Microsoft 365 Password Before Expiry[random character string]
[Company Name] HR: Employee Guidelines Ref ID: [Random characters]
[Company Name] sent 3rd Quater Performance-Based Review and Annual Raise Ref :[random character string]
Payroll Adjustment Q2 Performance Review and Employment Compensation Ref [random characters] [Date]
The filtering functionality is very limited, so even if there's an obvious pattern, one can't create any rule to prevent it. Responses are slow and unhelpful. It actually seems like it's been getting worse lately, though it's hard to tell. Review collected by and hosted on G2.com.
