Unable to receive or send e-mails in Microsoft outlook

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The following error msg show:

Receiving reported error (0x800CCC18): Your e-mail server rejected your login with Secure Password Authentication (SPA). Verify your account properties . Under tools, click E-mail accounts.

I have now unclicked the 'Require login using Secure Password Authentication (SPA) box and can now send/receive.

I have never even looked at this box before and therefore not changed anything prior to todays problem. There was an update performed yesterday from windows, has this caused the problem and is it ok just to leave this box unchecked? Thank you in advance for any replies.
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