As far as I know, this nickname doesn't appear in the email the recipient receives. You can try and create a bogus contact with one of your own email addresses, and send a message to it/him (her?). You'll only see the email address when placing your pointer on the "You" caption in the "To..." field.
But then, I don't give nicknames to my contacts...
My tests review: if you have a first and last name and nickname, when you create an email, the nickname will show and you are right, the nickname only is seen by the sender.
BUT.. if you only have a nickname and no first or lastname, the nickname text does transfer to the recipient.
Thanks for getting me to test and try this.
This is kinda my problem. I have a nickname appearing next to my return emails. It says "Sexy" which i was mortified about until i realised nobody else can see that only me. I have no idea how this name arrived and i cant find how to delete it. Its not in my address book or in contacts, have no idea. My kids and I played around with Siri awhile back and were saying things like "am i sexy" and the like which was hilarious but this is the only thing I can think of. Checked mail in Iphone and work computers. Cant find it anywhere. My email replies come in as
"John Smith "sexy " " any ideas?
Cam. I finally figured out how to get rid of it (my nickname was nowhere near as fun as "Sexy"). Go to the Address Book and check your contact info. If it doesn't show up as part of your contact (it didn't in my case), do a search in your contacts for "Sexy" (or whatever the nickname maybe) and it should find it. It wil show up in a field right under your name. Select the "edit" option and you can delete it.