Undelivered Mail Returned to Sender

6 years ago

In der letzten Zeit versuche ich immer wieder, eMails von ...@t-online zu einer Adresse von ...@hotmail.com zu senden.

The mail System ...@hotmail.com said: 550.5.7.1

Please contact your internet service provider since part of their network is on our block

List(S3140)

Wo liegt der Fehler? Was muss getan werden, um wieder emails an ...@hotmail.com senden zu können?

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