I have changed internet providers, my iPad recognises and connects to the new provider, I am receiving emails but cannot send them, please can you help?
Make sure on the account you're trying to use... in Settings>> Mail, Contacts, Calendars>> (Select Account)>> Account... look at the outgoing mail server - make sure that matches the domain name of the email account.
If all of your mail is stored server side, you can also remove the account and re-add it. When it gets added back in the settings should be populated for you.