That is literally a thing you know… gmail won’t accept email from some servers unless they follow some specific, ever-changing standards. It’s just that gmail is one of the largest providers, so people jump through major hoops to ensure that they accept emails from them.
That is literally a thing you know… gmail won’t accept email from some servers unless they follow some specific, ever-changing standards. It’s just that gmail is one of the largest providers, so people jump through major hoops to ensure that they accept emails from them.