Wir bekommen jetzt beim Senden einer Bluewin-Adresse folgende Fehlermeldung:
"host outlook-com.olc.protection.outlook.com[52.101.73.20] said: 550 5.7.515
Access denied, sending domain BLUEWIN.CH doesn't meet the required
authentication level. The sender's domain in the 5322.From address doesn't
meet the authentication requirements defined for the sender."
Was können wir da tun?
Danke