On 1/2/20 10:47 AM, Hector Santos wrote:
With hosted end-users, the false positives seen with NATs has been
addressed with the SUBMIT protocol or some other client authentication
that raised the SMTP bar and allowed for receiver restrictions.
In these days of complete IPv4 address space exhaustion, it can not be
safely assumed that there is no NAT between the MSA and the MX SMTP server.
Keith
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