Here are some steps to take if you are unable to send emails from your iPad.
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Turn iPad off and then on again
To turn the iPad off, press and hold the Sleep/Wake button until the Apple logo appears, then drag the slider.
Give it a minute to shut down, then press and hold the Sleep/Wake button until the Apple logo appears.
In Settings, turn on other SMTP servers
- Tap Settings > Mail, Contacts, Calendars and under Accounts, tap the account from which you’re trying to send email:
- Scroll down to Outgoing Mail Server and tap the box that says SMTP:
- Turn on all other SMTP Servers.
Add additional information to SMTP servers
Start with the primary SMTP server, make sure all the correct information is entered, even the optional information. The optional username and password may be required here if SSL is turned on.
Add your email account on iPad instead of syncing your mail settings from your computer
- In iTunes, select iPad in the source list on the left, under Devices.
- Select the Info tab.
- If selected, deselect Sync Mail Accounts.
- Click Apply.
- Disconnect iPad after it has finished syncing.
- On the iPad, tap Settings > Mail, Contacts, Calendars and under accounts, tap Add Account.
- Next select the type of email account and follow the instructions. When you enter your email address, iPad will look up your service provider’s settings for you. If the iPad can’t find your service provider’s settings, you can enter them directly or contact your email service provider for the settings.
If None of These Steps Work
I recommend using a free Gmail account, add your other email addresses to the Gmail account, then add the Gmail account to your iPad.
There are other advantages to doing this, such as, a unified inbox, folders and being able to view email from Safari.