How connect Outlook to Office 365 without change the MX record of my domain yet?

I want connect my Outlook to Office 365 without change (yet) the MX record. On Outlook I’ve already an IMAP account to the current mail server and I want copy and paste only a few email manually. When all will work I’ll change the MX record and I’ll switch the current mail server off.

I’ve changed my record autodiscover.mydomain.com to autodiscover.outlook.com but unfortunately I can’t authenticate on Office 365 because my default address (domain) at present is mydomain.onmicrosoft.com and not mydomain.com. I can’t change default domain because I’ve not changed the MX record..

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