Sep 26 2020 03:49 PM
Sep 27 2020 04:11 AM
@Konstadinos Siskidis I am not sure if it's doable in Outlook however it can be achieved using a Transport rule from Exchange Admin Center in O365.
Transport rule can be something like: If the sender is "your email address" and subject contains "RE:"
Action would be, "bcc the message to.." select your partners account and save the rule.
Sep 29 2020 04:29 AM
@Konstadinos Siskidis An admin in O365 can create a rule for such a situation. if your mailbox exists in O365, then whomsoever manages your accounts can create a Transport rule with the conditions I shared in my last message. You can refer to the below article, if you want to know about mail flow transport rules in Exchange online: