Cannot Download Email from Server, but can Send

As of a couple of days ago, I cannot receive email from my main server account to which all other email boxes forward. I can, however, send email.

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Tried clicking Advanced, under "check with your system administrator before changing any of the advanced options below:" deselected Use SSL, chose authentication of Password and automatically chose port 110.

That did not work.

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Can someone please help me fix this? It is a pain to go to webmail.

Thank you in advance.