I basically have abc.com and def.com on the same server. I have an email script that I want to send emails out from abc.com even for def.com. But I keep on getting it in the spam or junk box or even nothing show for gmail.com, aol.com, hotmail.com and so on.
Well, I dig in for more info and found out that it has to do with the SPF. Which I know nothing about.
I have enabled all the options in "Email Auth" already. I don't know about:
Additional Include For SPF (one Per Line)
Additional Redirect For SPF (one Per Line)
Additional Domain For SPF (one Per Line)
Can someone give me advice what to do?