I'm trying to send and receive e-mails and got this error. The e-mails are:

consult2@portconsult.com.br

luciane@premiumcftv.com.br

sme@evoluatelecom.com.br

contato@serralheriapunhosdeaco.com.br

adm.parana@globalcare.com.br

Error:  Sorry, your envelope sender has been denied (#5.7.1)

I sent an e-mail to Zoho days ago (07/07) and theres no answer 'till now. Its urgent, please!