Why My IP is Block in SPAM Database ?

These businesses do not add just any IP addresses to their list. Those lists are there due to your messages having the "look" of spam, customer complaints or marking them as spam. If you wish your mail to get through, then it is up to your customers to make sure they check their spam boxes, and return your mail to their inboxes marked as "Not spam," plus they need to place your address into their address books to help to insure that address as a "safe" one.