On 2019-11-27 09:31, Wesley Peng wrote:
Thanks. While I am still not clear about what the description in mxtoolbox. Can you give more details?
I've never used the "exists" keyword, it's for more advanced use case and rely on SPF macros. You'll find some examples online, like here: https://scotthelme.co.uk/email-security-spf/ A more complete source can be found in the SPF RFC: https://tools.ietf.org/html/rfc7208#section-7.2
regards
