Hello
Am 23.09.20 um 15:29 schrieb nikos:
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?
Seems you have an encoding problem in your subject fields. I assume you add something which isn't in a character set matching your List settings for default language. Therefore mailman doesn't encode it properly and sends 8-bit characters in the subject. Specifically the starting: +AFs-Ps+AF0-+AD0-
Kind regards, Christian Mack