Hi Maria.

If you're sure that from only that specific email domain, the emails won't work, but from others it does (like gmail, hotmail, yahoo, etc...), I believe you're probablt better off referring to your hosting's support directly, since there might be something on their side that is blocking whatever mail is received by t-online.de

Most probably this is something wrong with the mail server rather than the software.

Please verify and keep me updated on this

Thank you

Stefano

Der Kunde kann irgendwelche Email nehmen, aber du solltest im Projekt bei der "Email für den Eingang der Bestellungen" immer die Domain Email nehmen die keine Blocker enthält wie bei der t-online Adresse.