There are several methods to monitor inbox placement:
Seed Lists: A seed list is a group of email addresses that you send your campaigns to in order to monitor how different email service providers (ESPs) handle your emails. This allows you to see where your emails land (inbox, spam, or other folders). Third-Party Tools: Several third-party tools offer comprehensive inbox placement monitoring. These tools provide insights into your deliverability rates and help you track issues across different ISPs and domains. Feedback Loops: Some ISPs provide feedback loops that notify you when recipients mark your emails as spam. This information can help you adjust your email marketing practices to improve inbox placement.