How can we know that mail is read by recipient

Unfortunately, there's no foolproof way to know for certain that an email has been read by the recipient. However, here are some methods that can provide some indication:

  1. Read Receipt: Some email providers, like Gmail, allow you to request a read receipt from the recipient. When the recipient opens the email, they'll receive a notification asking if they want to send a read receipt. If they agree, you'll receive a notification indicating that the email has been read.
  2. Tracking Pixels: Some email marketing platforms and services use tracking pixels to track the recipient's behavior, including whether they've opened the email. These pixels are usually invisible to the recipient and are used to gather data on email engagement.
  3. Email Client Indicators: Some email clients, like Microsoft Outlook, display a "read" indicator next to the email subject line or in the email list view. This can give you an idea if the recipient has opened the email.
  4. Bounce or Delivery Reports: If you're sending emails to a large number of recipients, you can use bounce or delivery reports to track whether the emails have been delivered and opened. These reports can provide insights into email engagement, including whether the email was opened.
  5. Social Proof: If you're sending emails to a small group of recipients, you can ask them directly if they've read the email. This can be a simple and effective way to gauge engagement.
  6. Email Analytics Tools: There are various email analytics tools available that can help you track email engagement, including open rates, click-through rates, and conversion rates. These tools can provide insights into how recipients are interacting with your emails.
  7. Recipient Feedback: If you're sending emails to a small group of recipients, you can ask for feedback on the email's content and relevance. This can help you gauge whether the email was read and understood.

Keep in mind that these methods are not foolproof, and there's always a chance that the recipient may not have read the email even if it appears to have been opened or tracked.