554 5.2.3 MailPolicy violation Error delivering to mailboxes

554 5.2.3 MailPolicy violation Error delivering to mailboxes

Hello,

I use Zoho Mail for my business (www.saveyourskin.co.nz).

Today I wanted to write an e-mail to 80 customers, but now the message above appears and I can not use ZOHO to write e-mails any more.

Please can you advise me, what I need to do. Is there a maximum number of e-mails per day?

Thanks and kind regards,

Dr. Peter Stoeveken