You may check this to make sure you're using the right account settings: https://www.postbox-inc.com/setup/email-settings/access-wanadoo-fr-via-imap-smtp But I think Wanadoo and other similar email addresses that were freely available many years ago are "deprecated" and will eventually stop working sooner or later. You should consider the intermittent problems you're experiencing now as a sign that you better start using another email address before it stops working altogether.

''<p>Yves Comberton [[#question-1493494|said]]</p>'' <blockquote>From one day to the next my mailbox doesn't work anymore. I'm asked for my IMAP password: I put the one from my Orange mailbox and it's refused. Thank you very much. </blockquote> When you're asked for the 'IMAP password', is this an application password? If not, [https://assistance.orange.fr/ordinateurs-peripheriques/installer-et-utiliser/l-utilisation-du-mail-et-du-cloud/mail-orange/le-mail-orange-nouvelle-version/parametrer-la-boite-mail/mail-orange-generer-un-mot-de-passe-dedie-pour-consulter-sa-boite-mail-orange-depuis-une-application-ou-un-logiciel-de-messagerie-non-fourni-par-orange_441119-970656 create one on the Orange site], remove the current entry for the account in Saved Passwords in Settings, restart TB, enter the app password when asked for the password. https://assistance.orange.fr/ordinateurs-peripheriques/installer-et-utiliser/l-utilisation-du-mail-et-du-cloud/mail-orange/le-mail-orange-nouvelle-version/parametrer-la-boite-mail/mail-orange-comment-acceder-a-sa-boite-mail-orange-depuis-une-application-ou-un-logiciel-de-messagerie-non-fourni-par-orange_434630-964290#