The Delivery Profile is where the IP address for sending emails is configured. NTO should update the Delivery Profile for the transactional sends to use the new IP address

Contacts analytics is a report that shows how the cross-channel customer population has changed over time. It can be used to track the growth or decline of contacts across different channels, such as email, mobile, or social. Contacts count is a report that shows the total number of contacts in the account. Audience engagement over time is a report that shows how contacts interact with messages over time.

The action that the retailer should take to ensure deliverability is not impacted is to send to subscribers, asking for them to confirm opt-in1. Confirming opt-in is a best practice that helps the retailer maintain a clean and engaged email list, which can improve their email reputation and deliverability2. By asking subscribers to confirm their interest in receiving the loyalty series, the retailer can avoid sending unwanted or irrelevant emails that may result in spam complaints, unsubscribes, or low open rates. Confirming opt-in also helps the retailer comply with the CAN-SPAM Act and other privacy regulations that require consent from email recipients3.
Creating a new, friendly From Name for the updated program is not the correct answer, as it does not help with ensuring deliverability. While having a clear and recognizable From Name is important for branding and trust, it does not affect the deliverability of the email itself4. Moreover, changing the From Name too frequently or drastically may confuse or alienate subscribers who are used to seeing a consistent sender identity.
Purging inactive subscribers to avoid high bounce rates is also not the correct answer, as it does not help with ensuring deliverability. While removing invalid or non-existent email addresses from the list can reduce bounce rates, it does not address the issue of subscriber engagement or consent. Purging inactive subscribers may also result in losing potential customers who may still be interested in the retailer's products or services, but have not opened or clicked on their emails recently. A better approach is to segment and target inactive subscribers with re-engagement campaigns that offer incentives or value propositions to renew their interest. References := 1: Email Deliverability Best Practices for Email Studio - Salesforce 2: Email Deliverability in Salesforce: Ensuring Successful Email Campaigns 3: CAN-SPAM Compliance System Guide
- Salesforce 4: Marketing Cloud Deliverability Options - Salesforce : How You Can Keep Email Subscribers Engaged | Salesforce : Build and Analyze Customer Journeys using Marketing Cloud ... - Salesforce

The sending relationship determines which field in the data extension is used as the subscriber key and email address for the send. If the sending relationship is incorrect, the send will fail because Marketing Cloud cannot identify the recipients

The configuration that should help with limiting a spike in volume to the website is Send Throttle1. Send Throttle allows you to specify the number of emails to send per hour, which can help you control the traffic to your website and avoid overwhelming your server or exceeding your bandwidth limit2. By using Send Throttle, you can also improve your email deliverability and avoid being flagged as spam by ISPs that monitor sudden spikes in email volume3.
Sender Authentication Package is not the correct answer, as it does not help with limiting a spike in volume to the website. Sender Authentication Package is a feature that helps you authenticate your email sender identity and domain, which can improve your email reputation and deliverability4. However, it does not affect the rate or timing of your email sends.
Web Collect Sign-Up Form is also not the correct answer, as it does not help with limiting a spike in volume to the website. Web Collect Sign-Up Form is a feature that helps you collect email subscribers from your website, which can increase your email list size and engagement. However, it does not affect the rate or timing of your email sends. References := 1: Send Throttle - Salesforce 2: Marketing Cloud Email Specialist Certification Guide & Tips 3: Email limitations in marketing cloud - Salesforce Developer Community 4:
Sender Authentication Package - Salesforce : Web Collect Code Samples - Salesforce