Unfortunately, blacklisting sites (especially Spamhaus) are getting more aggressive when it comes to new domains being set up for cold email marketing and they do not list or provide specific reasons why a site will be listed.

This is based on their website:

  1. Domains must match several criteria in order to be listed.
  2. We will not reveal specific listing criteria in most cases.
  3. DBL listings are constantly reevaluated by our systems, and listings do expire automatically when listing criteria are no longer met.

What we advise our clients to do is to start sending to good quality data, with a consistent sending schedule in order to build up reputation, essentially “training” these ESP’s / listing sites to be more familiar with your sending profiles (domain and IP). This will build up trust and reputation.