REJECT ANY EMAIL, WHEN THE RETURN ADDRESS IS NOT VALID.
REJECT ANY EMAIL, WHEN THE RETURN ADDRESS IS NOT VALID. Many spam emails have not a valid return address.

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Joyce Krechting commented
The majority of my email is from those that wish the recipient to click on links that will then compromise their computer. They always have an invalid address but try to fool us into believing they are a legitimate sender. Many are suggesting I have won something like money or a much desired gift when I may have never done business with them. So many of this kind of email makes it difficult for me to find legitimate emails.
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Gordon Robinson commented
How do we stop spam from the USofA
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Gordon Robinson commented
Too many spam emails coming from the USA
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Chance Master commented
This goes hand in hand with trying to enter the sender email address in the Block List.
When sender address is entered AOL display "invalid Address".
Of course it is.
Plus due to the fact it is invalid, when trying to block the Domain Address, get message "Invalid Address". -
Traudl Kozanecki commented
This is such a simple criterion that it could be implemented fast. Thank you very much !
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Traudl Kozanecki commented
THIS SIMPLE CRITERION REMOVES MOST OF THE SPAM MESSAGES AND THE USER WILL NEVER SEE IT, EVEN NOT IN A JUNK FOLDER