Loading
Connectivity issues between Mulesoft and customer corporate network.Read More
Salesforce Enforces New Security Requirements in Summer 2026Read More
Marketing Cloud Engagement
Update DNS File to Manage Replies

You are here:

  1. Salesforce Help
  2. Docs
  3. Marketing Cloud Engagement

Update DNS File to Manage Replies

If you decided to self-host when you configured SAP, and haven't set up reply mail management, you can configure it at any time. Work with your IT or web admin to add the necessary MX record to your DNS zone file. If you chose to delegate your domain, the MX record is already in place.

One of the records that you add to the DNS console is based on your Engagement instance. You can find your instance number in your browser URL. Log in to Engagement, and look for the domain: mc.s##.exacttarget.com. The s## number is your instance.

Contact Salesforce Customer Support for assistance.

  1. In the DNS zone file, add the MX record with your preferred domain.
    • To use a base domain, replace the default @ value with your domain name.
    • To use a reply domain, append your domain name to reply, so that it appears in the format reply.sub.domainname.ext.
  2. Then, add IN MX 10 and the correct value for your instance.
    For example, if you are on the S7 instance, enter inbound-reply.s7.exacttarget.com.
    • inbound-reply.s1.exacttarget.com.
    • inbound-reply.s4.exacttarget.com.
    • inbound-reply.s6.exacttarget.com.
    • inbound-reply.s7.exacttarget.com.
    • reply.s10.exacttarget.com.
    • reply.s11.exacttarget.com.
    • reply.s12.exacttarget.com.
    • reply.s13.exacttarget.com.
    • reply.s50.exacttarget.com.
    • reply.s51.exacttarget.com.
  3. In Engagement Setup, search and select Reply Mail Management.
  4. In the Reply Subdomain field, enter the domain or reply domain that you added to the DNS zone file.
  5. To confirm that you've completed the DNS work, select Yes, and then save your work.
Example
Example Javier wants Ursa Major's maintenance email replies to be managed through their reply domain. Here's how he configures the MX record.
$TTL 1H
$ORIGIN service.ursamajor.com

reply.service.ursamajor.com	IN MX 10	reply.s13.exacttarget.com.
Meanwhile, at Northern Trail Outfitters, Dana chose to manage retail replies through the base domain. Here's what that MX record looks like.
$TTL 1H
$ORIGIN shop.nto.com

shop.nto.com	IN MX 10	inbound-reply.s4.exacttarget.com

You can also use Google tools to verify what's already in place. Visit https://toolbox.googleapps.com/apps/dig/#MX/, and enter your domain or reply domain.

 
Loading
Salesforce Help | Article