Disclaimer : This is a feature request for features from another similar software. mutt has a 3-character notation to indicate message flags. From muttrc(5): ``` %Z a three character set of message status flags. the first %character is new/read/replied flags (“n”/“o”/“r”/“O”/“N”). the %second is deleted or encryption flags (“D”/“d”/“S”/“P”/“s”/“K”). %the third is either tagged/flagged (“*”/“!”), or one of the %characters listed in $to_chars. ``` We already have most of the flags already built into aerc ( O/N/r/D/!/* ). What we are missing is the encryption and the 'to_chars' status flags. I do not think the encryption status flag requires any detailing. For the to_chars flag, it makes sense when looking at folders that contain both incoming and outgoing mail. It could be difficult to know which emails are incoming and which went out - especially when using the %F flag in the index_format. It would be nice to have support for the extra flag fields. Or one merged with the existing %Z flag but with a 3-character notation as in mutt - the first being the existing flags ( O/N/r/D/!/* ), the second being the encryption status flags ( S/P/K ) and the third being the to_chars ( ' +TCF' ). I cannot think of a way where the flags can be merged into the same single character field because they are mutually inclusive and can co-exist together simultaneously.