I've just received this message (No fue posible enviar el mensaje;Motivo:554 5.1.8 Dirección del remitente bloqueada) trying to send an email. Can you tell me why is my email blocked? Can you unlock it so that I can reply to my customers, please?

I just got an email from my email marketing's platform telling me that there's been an issue today sending emails to the Gmail accounts, so I guess that's the reason why my account manuelr@rollingproducciones.co has been blocked in Zoho.

They also told me this issue has been already solved so please, can you unlock my account manuelr@rollingproducciones.co so that I can send them my emails again?

Kind regards.