No reply notifications from '-f', and how the Mai servers like mail, Yahoo, Live Picks up the Mail

I hv mal accounts with Gmail, Yahoo, and Live. Every time I get a notification from Hi5, Twitter, LinkedIN, the mail servers pick up the first letter of the notification sending social network services. For example Hi5, will be Tagged under "H", Twitter as "T" while LinkedIN, Facebook will be displayed as

(L) LinkedIN
(F) Facebook

However, when no reply notifications are sent from MyHoTFB,COM the mail server will display the mail as:

I have noticed the address details of Hi5, LinkedIN, and others which are formatted as

Hi5 <> and the other also follow the same format.

I have similarly configured the with label as MyHoTFB <> in the mail server, hoping Mail Servers will categorically display  emails  under alphabet (M) over (?), but it didn't work and I realize it has something to do how mails are formatted through plugins like HTML Email Handler, and HTML Email Morden.

It would be nice to see that (?) disappear. Is there any one have a solution with a solution?