Can't Retrieve POP3 Email on SOME computers

I'm having a weird issue. A computer on our local network cannot retrieve pop3 email from one of our servers and neither can a client.

However, on another computer on the same local network, we can retrieve pop3 email fine.

Has anyone ever experienced this? Maybe there is a quick fix to this. Nothing has been changed on our network in the last few days, as this problem just appeared suddenly.

Thanks

 

 

 

 

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