Verizon is blocking Zoho mail as spam

Verizon is blocking Zoho mail as spam

Whenever I try to send to a Verizon email address I get the following:

ERROR_CODE :571, ERROR_CODE :Email from 74.201.84.163 is currently blocked by Verizon Online's anti-spam system. The email sender or Email Service Provider may visit http://www.verizon.net/whitelist and request removal of the block. 150630

Please help!