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RFC 2505: IMO the real problem is the sender MTA. If the receiver MTA...

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Comment by joaobr
Submitted on 6/22/2004
Related RFC: RFC 2505
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IMO the real problem is the sender MTA. If the receiver MTA could trust that all mail it receives is legal in terms of the sender address (user and domain), then this MTA could reject all other mail. Again IMO we should recommend and apply stricter rules the way a MTA should handle the UA SMTP requests. This MTA should strictly check if sender is local and a real legitimate user of the domain he tries to use in this occasion.Checking strictly sender data of mail at it's origin could lead to new possibilities of trust relationship between MTAs. The receiver MTA checks if it has a sender MTA. If not it ask for it. When having this key the MTA accept mail from the other MTA and believes that sender data is correct and legal.Even if not secure, such a method makes it possible to get to a responsible person what today is not exactly the case - or at least hard to realize.Most Internet recommendations we have today is how to protect us and even if not wrong we should control better how to protect others. Saying get yourself a bullet proof car is not a bad idea but better is trying to control who has the gun or even the gun itself.Joao at wipmail dot com dot br

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