What does the plus sign (“+”) in the message index mean?
A plus sign (“+”) in the left-hand column of an entry in the mailbox index view means that that message was sent directly to you, and not only Cc’d to you or sent via a mailing list. In other words, your address appears in the To: header. In mailbox view, WebMail occasionally shows the recipient, instead of the sender, of the message. WebMail’s mailbox view shows the recipient in the From column on messages for which you are the sender. (In other words, since you sent it, you know who the sender is, so WebMail tells you who you sent it to.) This is particularly useful for the sent-mail and drafts folders.
