SMTP on EXCHANGE with anonymous login

Hi,

We are trying to use ERPNext within our company. System is working fine, but we have a problem with sending emails.
We are using MS Exchange 2016 - IMAP is ok with login. BUT we are using SMTP with anonymous login.
(no possibility to change that).

So is there any way to tell ERPNext connect to SMTP (owa.server.com) on port 25 with TLS withour user/pass ?

ERPNext: v11.x.x-develop (0c3d345) (develop)
Frappe Framework: v11.x.x-develop (d38e5d5) (develop)

I am also using ERPNext at my own company with google apps and it’s working fine!

Thanks!