Norman Maurer wrote:
What i have forget is .. your wrote:

Not all resolvable/valid domains also have valid mx records configured.

A valid domain which is included in sender must have a valid MX..
Otherwise it would be impossible to send an email back. So i think the
MX is the only we should check.

Sure, that's right. I wanted to point out that we should document that the check is about MX presence and not "generic validity".

And yes, the mx check seems to me more correct and the only we should check (if the check is enabled).

Stefano


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