The IBM DNS Blacklist (Cobion) lists IP addresses that have been identified as spam sources. A positive listing can occur if several emails have been rated as spam by the Proventia Mail Security System or the Lotus Protector for Mail Security systems. This blacklist zone is part of the default configuration for both systems.
Are you confident your email is getting through?
You rely on email for business critical communication, so you need to know your email has been delivered to your customers and you need to know who is sending email on your behalf.
MxToolbox is YOUR expert on email deliverability. Delivery Center analyzes your DMARC, DKIM and SPF to give you the insight you need to make email configuration changes and get your emails to your customer's inboxes.