PHP Sending was Turned Off, and Now I'm Using smtp@DefaultDomainName.*** when Sending Email from Various Domain Names. And Yahoo is Giving a 554 Message Not Allowed Error, Simply from Replying to an Email that a Sister Sent to one of my Brothers & I. Is it Possible that Yahoo Sees 2 Different Domain Names in the Header, and Thinks It's Fishy? 8)
I Tested a Few Hours ago, and that Issue Hasn't gone away yet. 8)