Problems with Outlook that cannot be used in an external network

This little problem, because I didn't pay attention, caused me to waste a lot of time.

Although it is known that laptop user needs to fill in the correct proxy at Exchange proxy settings to use Outlook on the extranet, it is considered normal after comparing his setting and discovering that it is the same Although that address is not the company's webmail address. I also thought my setup was normal.

The final change to the company's webmail address is normal.

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