mike-stgt wrote:Question: correct SPF settings are my duty or my provider's responsibility?
An SPF record can only be added/modified by your ISP, end users cannot adjust this.
It appears either Warren's server is incorrectly interpreting your ISP's SPF record to mean your account can send spoofed SPAM, or perhaps it is indeed not set correctly, but you should be able to simply call them and ask them to verify and/or correct it.