Cant connect to mail fetching error.

Cant connect to mail fetching error.

Hi.

Seeking help to connect to mail fetching, its keeps saying error to mail.

We have:
exchange 2013 on a windows 2012 server
the servicedesk is installed on a windows 2012

I am confused about whish account I should use to connect with.

A domain account or that mail account?

see picture.

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