Remote Server returned ‘550 five.7.520 Message blocked since it consists of content material identified as spam. AS(4810)’
Anything in it seems to be spam. Possibly since of the topic and that it is becoming forwarded.
>> Content material-Kind: application/ms-tnef name=”winmail.dat”
It seems you are sending this from outlook desktop and the message format is RTF. Sending as HTML may well assist.
If you are applying outlook desktop software program, see
If you are applying outlook on the internet, delete the address from the autocomplete list.
Outlook Sources: https://www.slipstick.com
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