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There are several important metrics that you need to pay attention to when tracking the effectiveness of an email marketing campaign. Here are some important metrics that you should track and analyze:

1. Email Open Rate: This is the percentage of email recipients who opened the email. It shows how engaging your email subject line and content are.
2. Click-through Rate (CTR): This is the percentage of people who opened the email and clicked on the links in the email. It shows how engaging the content and links in the email were.
3. Conversion Rate: This is the percentage of people who took the action you wanted after receiving the email. For example, buying a product, registering for an event, signing up for a service, etc.
4. Unsubscribe Rate: This is the percentage of people who unsubscribed from receiving your emails. If this rate is high, you may need to reconsider your email campaign.
5. Spam Complaints: This is the number of people who reported your email as spam. If this rate is high, your email may be labeled as spam and affect your reputation.
6. ROI (Return on Investment): This is the rate of profit for each unit of money you invest in your email marketing campaign. This is an important indicator to evaluate the effectiveness of the campaign.

Tracking and analyzing the above metrics will help you better understand the effectiveness of your email marketing campaigns and improve future campaigns.