553 Relaying disallowed

553 Relaying disallowed

Hello,

The mailing service associated to my account is not working well.

I have tried sending test emails to my new address "support@xyz", and some of the emails go through, others say "The response from the remote server was: 553 Relaying disallowed"

I can send one email and receive it in my zoho box, and send another within a few seconds and it gets that error.

This is super strange and should not occur.

Your service is seeming unreliable to me.

Looking forward to your reply.

Best regards,
Miguel