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  1. M

    Sender verify failed

    Hallo, seit wir den Mailgateway einsetzten können wir einem unserer Kunden keine Mails mehr senden - Email wird mit Fehler: 550-Verification failed for <inbox@mydomain.de> 550-Unrouteable address 550 Sender verify failed abgeleht. Auf der Gegenseite läuft wohl ein Managed Server von...

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