the mail is IMAP, i checked with Samsung they basically said that this feature is not available on the S5 Active, i find that hard to believe, as i stated another older samsung phone clearly has the same looking e mail icon, and shows a green arrow when you reply or forward a e mail that is in your inbox. shurly there is a work around or another e mail application that would be able to do this.. There is no arrow or any indication that you did anything to the e mail in the inbox screen, it simply is greyed out it was read.
appriciate any assistance!