Several metrics can help measure the reliability of your email marketing campaigns:
Deliverability Rate: The percentage of emails successfully delivered to the recipients' inboxes. Open Rate: The percentage of recipients who open your email. Click-Through Rate (CTR): The percentage of recipients who click on a link within your email. Bounce Rate: The percentage of emails that could not be delivered and were returned by the recipient's mail server. Unsubscribe Rate: The percentage of recipients who opt-out from your email list.