[exim] tls error - mail from *outlook

Hi everyone;

I installed exim4 on a Debian Buster, and I'm able to send and receive
emails from every domain.

But I've an error very similar to this
<https://lists.exim.org/lurker/message/20180207.150204.600285a6.en.html>

This is an example of an error I see when I receive an email from outook
domains:

TLS error on connection from
mail-vi1eur05on2059.outbound.protection.outlook.com
(EUR05-VI1-obe.outbound.protection.outlook.com) [40.107.21.59] (send):
The TLS connection was non-properly terminated

I receive the email, but I see this error on exim logs.

I tried to build exim against openssl, like they suggested, but It
didn't work.

Could you give me please some hints in order to debug or fix this?

thanks

Ale