Interactive Email Forms can significantly increase engagement and response rates by allowing recipients to complete forms directly within the email. For a post-purchase feedback campaign, including an interactive form where customers can provide their feedback without leaving the email can make the process more convenient and likely to yield higher response rates.
References: Salesforce Marketing Cloud Documentation on Interactive Email Forms

When troubleshooting why an email was not sent to a portion of the audience, it's important to consider several factors beyond unsubscribes or held statuses. Bounced contacts from previous sends could be a significant reason why emails are not delivered. Bounces occur when an email cannot be delivered to an email address, which could be due to various reasons like an invalid email address or the recipient's mailbox being full. Reference: Salesforce Marketing Cloud Documentation

Collecting emails at offline activities, such as in-store events or other physical locations, is a best practice for increasing subscribers. It ensures that the emails collected are from individuals who are genuinely interested in the brand and are more likely to engage with email communications. This method also helps to maintain the quality and relevance of the email list.
References: Salesforce Marketing Cloud Documentation on Subscriber Acquisition Best Practices

To ensure Northern Trail Outfitters' sending reputation remains intact, implementing a Sender Authentication Package (SAP) with a Private Domain and a Dedicated IP is the best course of action. This setup provides greater control over the sending environment, allowing the company to build and maintain its sending reputation without being affected by other customers sharing the same domain or IP. It also facilitates the use of SPF, DKIM, and DMARC authentication protocols.
References:
* Salesforce Marketing Cloud Documentation on Sender Authentication Package

The _Open data view in Salesforce Marketing Cloud contains detailed information about all email opens, including subscriber data and timestamps. This data view can be queried to identify subscribers who have opened emails within a specific timeframe, such as the past year, to target them with a "thank you" offer.
Reference:Salesforce Marketing Cloud Documentation on Data Views