Did some work for a mammary related business many years ago.<p>A periodic job was to go through &quot;Lois&#x27;&quot; inbox, and clean it out.  It seems their payment frontend simply generated an email for the backend payment processor (Lois).  Presumably, she manually keyed the cc info into a physical xon terminal to process payments. There were usually 10s of thousands of messages consisting only of credit card info sitting in the clear for months at a stretch.<p>It was FreeBSD though, so they were cool in my book :)