Marketing Cloud Account Engagement forms are the best option if you need data de-duplication in the CRM, such as Salesforce. Marketing Cloud Account Engagement forms can automatically match and update existing records in the CRM based on the email address or other unique identifiers4. Marketing Cloud Account Engagement forms can also create new records in the CRM if the prospect does not exist yet4. Form handlers, on the other hand, do not have this functionality, and may create duplicate records in the CRM if the prospect already exists

To review the deliverability statistics for an autoresponder email sent in response to a form submission in Pardot, the appropriate report to consult is the Autoresponder report. This report provides specific metrics on the performance of autoresponder emails, including delivery rates, open rates, click-through rates, and any bounces. Unlike generic form reports or list email reports, the Autoresponder report focuses on the emails triggered automatically after a form is completed, providing detailed insights relevant to these specific interactions.

According to the Salesforce documentation, the information that the tooltip above each step on the engagement studio program report provides is high-level metrics only for prospects who have completed the step. An engagement studio program report is a report that shows the performance and results of an engagement program, such as the number of prospects, emails, and conversions. The tooltip above each step on the program report shows the number and percentage of prospects who have completed that step, as well as the number and percentage of prospects who have taken the positive, negative, or neutral path after that step. The tooltip does not show the metrics for prospects who are waiting to complete, who have left, or who have skipped each step, as these are shown in other sections of the report. Reference: Salesforce documentation

According to the Salesforce documentation, the step type that would be used in engagement studio to add prospects to another engagement studio program's recipient list is an action. An engagement studio program is a feature that allows users to build, test, and report on automated programs that send targeted emails and perform actions based on prospect behavior and criteria. An engagement studio program consists of steps that define the logic and flow of the program. There are three types of steps: triggers, actions, and rules. A trigger is a step that checks for a prospect's activity, such as opening an email, clicking a link, or submitting a form. An action is a step that performs an action on a prospect, such as sending an email, adjusting a score, or adding to a list. A rule is a step that checks for a prospect's attribute or value, such as score, grade, or field value. To add prospects to another engagement studio program's recipient list, the user can use an action step that adds prospects to a list. The user can then use that list as the recipient list for another engagement studio program. A rule, an end, or a trigger are not the step types that would be used in engagement studio to add prospects to another engagement studio program's recipient list, as they are related to other functions, such as checking for criteria, ending the program, or checking for activity. Reference: Salesforce documentation

The administrator should go to Admin-Domain Management to check if the Email Sending Domains are set up properly after updating the DNS. Email Sending Domains are domains that you can use to send emails from Marketing Cloud Account Engagement, and they require verification and authentication to ensure that your emails are delivered and not marked as spam. To verify and authenticate your Email Sending Domains, you need to update the DNS records of your domain with the values provided by Marketing Cloud Account Engagement. After updating the DNS, you can go to Admin-Domain Management and click the Verify Now button to check if your Email Sending Domains are verified and authenticated