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.
6. Send this file to email@example.com for analysis and troubleshooting.