host ns-73.awsdns-09.com
205.251.192.73

Seems seeing an increased 'backscatter' from these servers, used maybe as a method to spread phishing materials..

Shows them as Exim servers, but no idea what those servers are meant to be doing? the dns reflection in the names suggest it isn't really meant to be mail servers?

Anyone with any details? The phishing appears to be coming via authenticated connections to those servers..

Received: from v-192-223-25-73.unman-vds.premium-seattle.nfoservers.com ([192.223.25.73]:63989)
        by ns-73.awsdns-09.com with esmtpsa  (TLS1.3) tls TLS_AES_256_GCM_SHA384
        (Exim 4.96)

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