Sept. 23, 2020
9:29 a.m.
Hello list.
For some reason none of hotmail or outlook users don't receive any of our newsletter. Finally all of them auto unsubscribe.
The following is an error received form protection.outlook.com:
Remote Server returned '550 5.6.0 CAT.InvalidContent.Exception: ExchangeDataException, Decoding of header Subject failed+ADs- raw value: +AFs-Ps+AF0- +AD0-?iso8859-7?b?wer98fnz5yDF8OX05enh6t7yIOXq5N7r+-fPn8iDz9Oft?+AD0-; cannot handle content of message
That happened since September 10th this year. Before, all received without problem.
Any suggestions?
Thank you in advance.
Nikos.