Problem with Content-Transfer-Encoding and Content-Type in the email header

[Django258]

On two different Directadmin servers installed in the same way, different encodings are displayed when checking the email header. I wanted to leave it in utf8 and 8bits as it happens on server 2, but server 1 for some reason is different:

Server 1

Content-Type: multipart/alternative;
boundary="=_e8f97cefb2106e5a4d976e71a8bdfb81"

--=_e8f97cefb2106e5a4d976e71a8bdfb81
Content-Transfer-Encoding: 7bit
Content-Type: text/plain; charset=US-ASCII;
format=flowed

dfsadfsadfsadfsa
--=_e8f97cefb2106e5a4d976e71a8bdfb81
Content-Transfer-Encoding: quoted-printable
Content-Type: text/html; charset=UTF-8

-----------------------

Server 2

Content-Type: multipart/alternative;
boundary="=_db34fad322fb5c040c82fc23fbc9394d"

--=_db34fad322fb5c040c82fc23fbc9394d
Content-Transfer-Encoding: 8bit
Content-Type: text/plain; charset=UTF-8;
format=flowed

ÃÉÉÉÉÉÉÃÃÃÃÉÉÉÉ´aÃÃÃaÃÃÃÃÃÃ
--=_db34fad322fb5c040c82fc23fbc9394d
Content-Transfer-Encoding: quoted-printable
Content-Type: text/html; charset=UTF-8

=================

In other words, how do I make server 1 have the parameters below:

Content-Transfer-Encoding: 8bit
Content-Type: text/plain; charset=UTF-8