Hi

I can not send e-mail to some of my Contacts. I get this message:

This message was created automatically by mail delivery software.
A message that you sent could not be delivered to one or more of its recipients. This is a permanent error.

 XXXXXXXX@cy.pwc.com Error, ERROR_CODE :577, ERROR_CODE :5.7.7 Unable to accept message

The mail-address is correct. I have sent to them for many years.

Now I got this message also:

Kan inte ansluta SMTP-server:smtpout.mail.zoho.com Orsak: Misslyckad bekräftelse:554 5.1.8 Sender Address Blocked

Please unblock

This i a very big problem for me so I need help as soon as possible.

Regards

Georg