On Wed, 11 Jul 2018, John R Levine wrote:
 If you're going to have a third party send mail for you, why can't you
 just list the third party IP address in your SPF record?


Oh, wait, I got it backward. On the outbound mail, you're right, it's the customer's domain so they can add the IP to the SPF.

On the inbound mail, the customer sees all the mail coming from the third party. In that case either the third party needs to do some filtering, or the customer needs to peek at the received headers to do some retroactive SPF checking.

Regards,
John Levine, jo...@taugh.com, Taughannock Networks, Trumansburg NY
Please consider the environment before reading this e-mail. https://jl.ly
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