I have been asked to set up reply mail management for a BU. I am completing the fields a the top of the screen (and I have read the help article) but I dont understand what this actually means for the system if I put something in these fields. Some of the BU's have multiple address domains that they can send from:
Email Display Name: The reply name appears in the From field of the subscriber email client, such as Microsoft Outlook, when the subscriber replies to your email. Do not use an email address as the Email Reply Name. To encourage interaction with your subscribers, use an individual's name from your organization, such as a member of your customer service group.
Reply Subdomain: The subdomain is the portion of your URL that points to Marketing Cloud email reply rules. For example, a company with an email address structure of firstname.lastname@example.org creates a subdomain of reply. That company then adds it to the box provided onscreen to create reply.example.com.
Email Reply Address: The reply address appears in the From name of your subscriber's email client when the subscriber replies to your email. While this information appears in the format of an email message, it is not a valid email address on its own. The address directs the reply to RMM for processing. Define this address in the Reply Mail Management feature or via a sender profile. If you use a sender profile to define the email reply address, you can enable the email message to use a multitude of email reply addresses.
If the BU has multiple domains that are used for sending, you still can send using those domains, but all replies would go to the same Email Reply Address. If you need the replies to go to the sending domain, you might want to look into Dynamic RMM:
Reply Mail Management (RMM) can direct valid replies to those dynamic From names instead of the default email address. Contact your Marketing Cloud account representative if you want to use this feature with your RMM configuration. This feature requires AMPscript knowledge.