How to know that sent e mail has been opened

Unfortunately, there is no foolproof way to know for certain that an email has been opened, as email clients and services have varying levels of tracking and reporting capabilities. However, here are some methods that can give you an indication:

1. Read Receipts: Some email clients and services allow you to request a read receipt, which is an automated response sent by the recipient's email client when they open the email. This can be enabled in the email settings or by using a third-party add-on. However, not all email clients support read receipts, and recipients can opt out of sending them.
2. Tracking Pixels: Many email marketing platforms and services use tracking pixels (also known as web beacons) to track email opens. These are small, invisible images embedded in the email that load when the email is opened. When the image is loaded, it sends a request to the tracking server, indicating that the email has been opened. However, some email clients and services may block or remove these pixels, making it difficult to track opens.
3. Open Tracking: Some email clients, like Gmail, use open tracking to track email opens. When an email is opened, the client sends a request to the sender's server, indicating that the email has been opened. However, this method is not foolproof, as recipients can disable open tracking or use email clients that don't support it.
4. Email Analytics Tools: Many email analytics tools, such as Google Analytics or email marketing platforms like Mailchimp or Constant Contact, provide insights into email opens, including the number of opens, open rates, and even the devices and browsers used to open the email. These tools can help you track email opens and provide valuable insights into your email marketing campaigns.
5. Subject Line Tracking: Some email clients and services allow you to track subject line opens, which can give you an indication of how many people have opened the email. This method is not as accurate as tracking pixels or read receipts, but it can still provide valuable insights.

To increase the chances of tracking email opens, consider the following best practices:

• Use a reputable email marketing platform or service that offers tracking and analytics capabilities.
• Use tracking pixels or web beacons in your emails.
• Request read receipts from your recipients.
• Use a clear and concise subject line that encourages opens.
• Segment your email list to target specific groups of recipients.
• Monitor your email analytics regularly to track opens and other key metrics.

Remember that while these methods can provide insights into email opens, they are not foolproof, and some recipients may still choose not to open your emails.