Transfert automatique

Bonjour,
il y a fort longtemps les mails reçus dans YAHOO étaient automatiquement dirigés vers une autre adresse mail (opération voulue)
Ayant oublié de relever cette boite mail elle est maintenant fermée et les opérations de remise en état ne fonctionnent pas.
De ce fait je reçois bien les messages sur YAHOO et l'envoyeur le message suivant :

Sorry, we were unable to deliver your message to the following address.

<xxxxxx@laposte.net>:
521: 5.2.1 Le compte emetteur bloque. The sender account is blocked. LPN007_426

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Date: Tue, 13 Nov 2018 14:03:21 +0000 (UTC)
From: Jean-Pierre YYYYY <yyyyy@yahoo.fr>
To: Jean-Pierre YYYYY <yyyyy@yahoo.fr>
Message-ID: <1548615377.2901610.1542117801686@mail.yahoo.com>
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Avez vous une méthodologie pour éviter ce problème sans avoir à changer mon adresse YAHOO
Merci d'avance
J.-P. YYYYY

(Adresses email et identité anonymisées par la Modération CCM.)