By doing so I effectively do not need anymore to be concerned about the FROM address in these forms...
Yes, you do. Having your MTA trust an IP for unauthenticated relaying is totally different from assuring your MTA, having accepted the msg, can deliver the message.
Many MXs are running SAV, sender address verification, so web apps that send send msgs with non-existent senders will be rejected by SAV MXs.
The other aspect of using deliverable envelope sender is that when a msg can't be delivered, it's usually useful for the envelope sender to be informed of the non-delivery.
I've seen plenty of "form hosting applications" that use bogus senders that fail to deliver but the hosted customer is not informed of the delivery failures. And hosting companies charge for such silliness.
Len
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