Does https://support.mozilla.org/en-US/kb/vacation-response or http://www.makeuseof.com/tag/set-mozilla-thunderbird-autoresponses-scheduled-emails/ help?

this is not the right solution! I know how to make an auto response ! But the answer comes not in the Russian language , the answer should be ..Hello.. but the letter of the answer comes hieroglyphs ..привет

this problem has only Russian language . English no problem . I don't know how to solve the problem of the Russian language auto answer

I determined that the received message (the message created from the template response) displays fine if I select character encoding KOI8-R.

Does that work for you?