If I try to send an email with a copy to me it doesnt work.
I can see the page with the information like "your email was sent"
but the recipient dont get my email and I become no copy.
T130723: Specific user with Yahoo address cannot use "email this user" function (unsubscribed after 5 bounces)
T134886: Special:EmailUser emails sometimes not delivered due to bounce
T137337: not being able to send emails via Special:EmailUser (Yahoo / GMail)