Eudora
Used by 6 peopleen.wikipedia.org ↗
“For the past 20 years plus the software I have used the most often was Eudora mail on the Mac.”
Kevin Kelly Interview, Writer, co-founder of Wired · via Uses This 
“I use Eudora 7 for email, because all of the new email clients are "unhygienic" about email data management.”
Andrew Huang Interview, Hardware misfit · via Uses This
