Thunderbird

I finally figured out why I kept seeing a mysterious “J” frequently in mails. I use Thunderbird, and it never struck me that what was common between all these mails is that they are all from Outlook users. It seems that in all its wisdom, Outlook converts any smileys (like : - ) ) in the plain text mails to the letter “J” in Wingdings, which stands for the smiley in that font.