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MDNs may be forged as easily as ordinary Internet electronic mail and whilst they can provide valuable information to the mail user, they cannot be relied upon as a guarantee that a message was or was not seen by the recipient. In fact, the Message Disposition Notification RFC 3798 is quite clear about the legal considerations of MDN messages: However, they were not intended to prove delivery of an email to a person, but as a way, more or less reliable, of making sure that the few servers that were online at the time were up and running and that emails got to destination. Read receipts are part of the Message Disposition Notifications (MDNs) and exist since the late 1970′. In any case, read receipts aren’t a reliable way to prove email delivery and obviously they don’t constitute legal evidence. But the truth is these systems are not reliable either as technology sometimes fails to recognize when an email is opened or not. There’s also email tracking systems that install a pixel in your emails to know when they are opened. This system fully relies on the recipient, as he/she has to manually return the read receipt – which means that you’ll probably get no answer in many of the occasions. A message is displayed asking the recipient to push a button to manually return the read receipt. Recipient receives and opens an email.Sender requests the acknowledgement to the recipient.What you need is a registered email with legal proof deliveryĪn email read receipt or a return receipt is a notification sent to the sender when an email has been opened by the recipient.Why email read receipts are not reliable.Received: (qmail 19074 invoked by uid 108 (TLS)) Mon, 17:32:42 -0000I checked all the headers and it looks like it was sent at 18:22:54 (Mountain Daylight Savings Time) and arrived to me at 20:22:57 (Eastern Daylight Savings Time) for a grand total of 3 seconds. You can still get to the old advanced search page with option to specify fare class at Very much doubt it involved actual changes to the "booking system". It's just a website front-end update (which they had been testing out on people for a very long time). In the example below, it only took two seconds to send from Delta to my Yahoo account The Received: headers in the raw email message will indicate if there were possibly queuing delays in delivering the email. Note that there can sometimes be SMTP MTA (message transfer agent) delays with email. If OP can't see it in the App, it sounds like it hasn't actually ticketed yet.
![mail receipt confirmation mail receipt confirmation](https://i.pinimg.com/originals/52/0e/4d/520e4d309bf1c0ad5839795a1f59be4d.png)
![mail receipt confirmation mail receipt confirmation](https://i.imgur.com/nz0fvfi.jpg)
This change in ticketing may be a part of that larger change.It's just a website front-end update (which they had been testing out on people for a very long time). Delta has changed a lot about their booking system recently including the removal of a way to search by fare class. The on-line receipt wasn't available until after the email was received. I booked a trip yesterday and the receipt wasn't emailed for 6 hours.