Is there any way to enable SPX consistently for a specific recipient address, rather than having to enable it on a message-by-message basis?
Since using SPX also relies on the Outlook plugin or an email client which supports custom headers on a per-message basis, would it not be a more flexible implementation if an MTA could be set to always set the SPX header, but have the UTM managable/configurable per user, who can then enable/disable SPX for specific sets of users?
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