On 2/10/23 10:23 AM, Wei Chuang wrote:
[]
SPF authentication is possible, but may not be advisable. The
Originator does this by publishing an SPF policy that covers the
Outbound Filtering Service IPs but this IP sharing weakens
authentication.
Why do you say it weakens it? Isn't it pretty common to import the SPF
record of ESPs, and in this case outbound filters into the sending
domain's SPF record?
If it does weaken it, wouldn't that apply to the ESP case too?
Mike
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