No fue posible enviar el mensaje;Motivo:554 5.1.8 Dirección del remitente bloqueada

No fue posible enviar el mensaje;Motivo:554 5.1.8 Dirección del remitente bloqueada

Good morning,

I've just received this message 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 info@mariamikhailova.com has been blocked in Zoho.

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

Kind regards.