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While, after much effort and probably significant cost, you may be able to get this information, it is largely pointless.
At the end of the day, anybody can obtain a gmail account under any name. There is pretty much no level of assurance that a gmail user is the person they claim to be.
Are you tempted to add a second email box to your form to make users enter their email address twice – really?
Why not verify their email address with real-time validation instead?
Solution 3: Make sure the recipient doesn't have an email message forwarding rule in place Did you send the original message to exactly the same recipient address that is shown in the NDR?
You can verify this by comparing the address provided in the NDR with the address shown in the original message that is in your Sent folder.
The "show details" button next to the sender details only gives a subset of information, not the full headers.
A related approach is to send them a HTML email that contains an inline image hosted on your website.There is no technical way to get the ip-address of someone sending an email via the gmail web interface. This can potentially be done through some sort of social engineering, if you can send an email back to the original sender and get them to click on a link in the email.You need to set up a website which logs the visitor's IP address, then somehow make the person who sent you that email visit your site.The auto-complete list is a list of suggested names that shows up in your email program when it finds a name that matches what you have typed on the To line.If you need more detail about this, see Remove suggested name or email address from the Auto-Complete List in Outlook Web App.