The email message header provides detailed information about the email message that has been received and has encountered problems. Here's how the email header to find and obtain:

 - Open a new incognito window (press Ctrl + Shift + N)

 - Open your e-mail in which there is a problem (with the sending, or another)

 - top right, click the three dots and select> Show original

 - In the new tab a text document will open.

 - Select the text below (starting with: "Delivered-To"), copy and paste it into a new text document (Notepad)         and save
 - Send this file to for analysis and troubleshooting.