E-mails sent from odoo SaaS end up in the spam box
I have issues where e-mails sent from a company on the odoo online platform are systematically registered as spam from Outlook, Gmail, ...
I want to solve this issue without configuring an outgoing mail server like I asked here : how-to-set-up-e-mail-messaging-with-odoo-61796
I guess it's a problem with the spf and DKIM records of my domain but I have yet to figure how to solve it.
This is the authentication of my e-mail : Authentication-Results: hotmail.com; spf=none (sender IP is 18.104.22.168) smtp.mailfrom=postmaster-odoo@my_company.odoo.com; dkim=none header.d=sharp-array.com; x-hmca=none firstname.lastname@example.org
Which in short means that postmaster-odoo@my_company.odoo.com wants to send e-mail as email@example.com
I believe since I don't have spf and DKIM records matching postmaster-odoo@my_company.odoo.com for the domain sharp-array.com, outlook and gmail believe I am trying to impersonate sharp-array and register me as spam.
Thus my question : How to set up spf and DKIM properly?