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Can't add spam senders to block user list because of invalid address

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Can't add spam senders to block user list because of invalid address

Recently, I have seen a drastic increase of a 'new' tactic by spammers to avoid detection and circumvent any rules you might have set.  I try to block a sender in Outlook, only to have the action error because the sender has a malformed address. Here is one that arrived today " PIatinum Vlsa Card <lnfo-9ohX@oVh5sGzSqXQrLFZPNjG> "  There seems to be a breakdown somewhere that is permitting bogus email to enter the network. It would seem prudent for one of the ISPs to initiate a change to the RFCs to better identify bogus emails and get them removed rather than process and deliver.