> Tools -> Account settings -> Server settings -> Default character encoding -> utf8
>
> Tools -> Account settings -> Composition & addressing -> nuimk varną nuo compose in HTML format

i taviskius reply ">" susideda..

Tavo:
Content-Type: text/plain; charset=utf-8; format=flowed
Content-Transfer-Encoding: 8bit
User-Agent: Mozilla/5.0 (Windows NT 6.1; rv:31.0) Gecko/20100101 Thunderbird/31.7.0

Bronco:
Content-Type: text/plain; charset=utf-8; format=flowed
Content-Transfer-Encoding: quoted-printable
User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:38.0) Gecko/20100101
 Thunderbird/38.3.0