The FROM column on the Message list doesn't shows the full "Name Surname <name@domain.com>" address. Just Name and Surname or in case of NAME SURNAME absence it shows the e-mail itself. It's would be good to have option to see the full name and address in standard form "Name Surname <name@domain.com>" as well. It'e extremely helpfull to recognise spam messages at once and mark it immidiately without reading. Thank you for creating great email client (IMHO the best)!
Whatever way you look at this, setting it to Importance "major" is overstating it. Please read the manual, in the Hidden Preferences section, look for 'summary_from_show' option. http://www.claws-mail.org/manual/claws-mail-manual.html#adv_hidden In other words, that's already possible.