Email stuck in Outbox Tech Support

Email stuck in Outbox

I recently added my work Outlook account to my laptop, I can receive emails at home but I can't send.  I can send emails out anywhere else.  My IT says it has to do with my AT & T account but when I called them I spent an hour and a half on the phone with
them and they can't give me answer on how to fix it.  I am not a techy person.  I think my settings need to be changed but I am not sure what needs to be changed so that AT&T will allow my email to send from my account.
 
Thank you

Anwsers to the Problem Email stuck in Outbox

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If you failed to fix it, another option is to call Microsoft and walk through the process with a technician. To do this, dial "1-800-936-5700". Explain the error that you received and the steps in the update process during which it was displayed. The technician will be able to walk through the steps from getting a new product key to finishing the installation.

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