Email always quarantined by SMG ?

People,

Can anyone here please assist me with how to reconfigure the SPAM rule how to fix this issue where email coming from one legitimate sender (eta@mailcall.com.au) ?

for some reason it always stuck in the Spam Quarantine area daily even when I have click [This is NOT a SPAM] button and put the email domain *@mailcall.com.au as white listed.

Upon further checking with https://testconnectivity.microsoft.com/ Message Analyzer, it shows that the timestamp is Invalid Date.

Thanks in advance.