Check sending mail doesnt work correctly

My Fireman version is 2.0.0.
It successfully works on my domain

When I try to check sending mail: (Administer -> Settings -> Email -> Test emai button) it doesnt work correctly.

At Chromium (DevTools -> Network tab), I see that the request is sent to

Question is:
Could you help me and tell how can I change to for this feature?

Hey, welcome. For emails you need to setup some things:

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