Even after you have added your incoming server email accounts (another step when learning how to set up email on iPhone), there are still a few tweaks you can make using the Mail app on your iOS device to manage your email accounts seamlessly: Set a default account that will be used when composing new messages: Go to Settings > Mail and scroll to the bottom. Tap Default Account. Tap the account you want to use as the default when composing and replying to new messages. Switch between email accounts when composing new emails: Open the Mail app. Press the Compose icon that looks like a paper and pencil. Tap the From field. Select the account you want to use by tapping it. Disable an email account if you have multiple email accounts and are no longer using one or more of them: Go to Settings > Mail. Tap on Accounts. Select the account you no longer want to use. Tap the switch next to Mail to toggle it off. To re-enable the account, toggle the Mail option back on. Repeat this process for any additional email accounts you want to disable. Delete an email account instead of disabling it: Go to Settings > Mail > Accounts. Tap the account you no longer want. Tap Delete Account. Tap Delete From My iPhone.