Failed to send share by mail

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Nextcloud version (eg, 10.0.2): 12.0.3
Operating system and version (eg, Ubuntu 16.04): Win10
Apache or nginx version (eg, Apache 2.4.25):
PHP version (eg, 5.6):
Is this the first time you’ve seen this error?: No

Can you reliably replicate it? (If so, please outline steps):

The issue you are facing:
Unable to share file to some specific email address: "". Error as “Failed to send share by mail”, even after 20x attempts. Tested on different client.

The output of your Nextcloud log in Admin > Logging:

The output of your config.php file in /path/to/nextcloud (make sure you remove any identifiable information!):

The output of your Apache/nginx/system log in /var/log/____:

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Je viens de passer de la version à la version 14.0.4 et je ne peux plus partager mes dossiers par email : “Failed to send share by mail”. J’ai bien configuré le serveur e-mail, mais rien n’y fait : “Une erreur est survenue lors de l’envoi de l’e-mail. Veuillez vérifier vos paramètres. (Erreur: Connection could not be established with host [Connection timed out #110] Log data: ++ Starting Swift_SmtpTransport !! Connection could not be established with host [Connection timed out #110] (code: 0))”.
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