The Domain Blacklist contains all domains you have added which will permanently fail verification when tested. All email addresses you verify through Bulk Email Checker are filtered against your domain blacklist to ensure addresses on these domains never make their way back into your clean data ever again.

To add domains to the Domain Blacklist you can insert them 1 at a time using the form below or drag and drop a file into the dropzone. Files must be in a valid CSV format with 1 column containing domains only.