Konstant is a Norweigan (Scandinavia) blacklist that lists known spammers who hit their honeypot spamtraps and through user submissions. Listings are manually moderated to prevent false positives with a threshold of moderate to high levels of complaints/spamtrap hits to trigger a listing.
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.