Emails will not send from my iPad

I have access to Internet, Facebook and emails coming in but I keep getting a message from Microsoft Outlook saying sign in to keep getting emails, daily! Even though I have just signed in, my emails are still sitting in my Outbox. This is getting extremely tedious, I am having to sign back in now more than once per day so that my emails will send.  Cn you please rectify this fault or I will be forced to change my email address to another provider.