email address wrong

My mum recently created an email account.
I think she had an old account... but forgotten the password.
So back to the story.. She wanted to email me...
But................... I got an sms instead.
& it goes like this..

Why I can't email you?
Your email address wrong is it?
=.=
Umm.. How can my email address be wrong le?
Oh, but guess who's the culprit?? My sister. She saved my email address short of 1 alphabet. Duh!!