On 5/18/25 4:09 PM, Randy Bush via NANOG wrote:
I think that most contemporary MTAs use some form of (weak)
authenticated identity. The most common that I see is reverse DNS
with forward DNS confirmation. A less common form of (client)
authentication is username & password.
DANE
DKIM, actually. And it's not weak, modulo use of DNS with its dodgy
DNSSec deployment.
Mike
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