Blacklisted sending IPs or domains can dramatically alter your ability to deliver mail to your customers.
Receiving networks (ISPs, hosting and filtering companies) often use third-party blacklists to reject and filter email. That's why 250ok Blacklist was designed with the flexibility and speed to notify you of listings as soon as possible. You can set up any combination of SMS or email notifications to instantly notify you when an issue occurs. Our global blacklist coverage includes Spamhaus, SURBL, SORBS, and more.