If you've set up more than one email account on your mobile phone, you need to select a default email account. When you write email, they'll automatically be sent from your default email account.
Step 1 of 7
Find "Email"
Tap Apps.
Step 2 of 7
Find "Email"
Tap Email.
Step 3 of 7
Select default email account
Tap the Menu key.
Step 4 of 7
Select default email account
Tap Settings.
Step 5 of 7
Select default email account
Tap the required email account.
Step 6 of 7
Select default email account
Tap Default account to select the email account as your default account.