Suddenly all our iPhones and iPad can no longer send email from our bluewin account to anyone else than bluewin addresses. We get the error: "Cannot Send Mail. A copy has been placed in your Outbox. The recipient address "email@example.com" was rejected by the server."
It works well if I send to myself or to another bluewin account, but not to addresses in other domains like gmail or hotmail.
It work without problems from the web interface on a computer to those addresses. Only not from the iPhone or iPad.
The problem appeared today. Was working all right last week.
Any ideas, please?