I have multiple domains with multiple mailservers on each. they all send with the same return path address. so email@example.com for instance.
I want to authorize any host on my domains ( abx.com, sksk.com, rwfjsdj.com and sssdr.com ) to send for firstname.lastname@example.org.
The domains listed above are mine and do not have spf records at this time.
v=spf1 a a:abx.com a:sksk.com a:rwfjsdj.com sssdr.com ~all
but that did not seem to work,because I may have multiple mailservers for abx.com etc.