Here an email would not officially withdraw the child. So make sure you know the policies. Here you have to write a letter of intent to homeschool effective such and such date and that goes to a particular office at the district (and I get a copy of it where it is stamped and dated received)....then you go to the actual school and sign some forms and you have to indicate where you are withdrawing to...and they code it withdrawal to homeschool (as opposed to private or moving out of district). Basically they need to know where to send a transcript and need to make sure you don't have any books (library or text books or other materials) that need to be turned in or paid for if lost.

...reading is pleasure, not just something teachers make you do in school.~B. Cleary