On Mon, Nov 16, 2020 at 10:34:08AM +0100, Enrico Morelli wrote: > 5F2E68092A2 335691 Mon Nov 16 10:00:40 i...@mydomain.it > (Host or domain name not found. Name service error for > name=recipient-it.mail.protection.outlook.com type=A: Host not found, > try again) recipi...@recipient.it
| % drill recipient.it mx | ;; ->>HEADER<<- opcode: QUERY, rcode: NXDOMAIN, id: 39998 Sorry, but recipient.it is not an existing domain. Use example.{com,net,org}! > The domain mail.protection.outlook.com is added to each address. > I haven't made any changes to the postfix configuration. Your recipient is hosted on Microsoft 365 and missconfigured. > Where is the problem? How can I solve it? There is no problem, just wrong configuration at your recipient. Bastian -- Actual war is a very messy business. Very, very messy business. -- Kirk, "A Taste of Armageddon", stardate 3193.0