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.
Click on the blue text Download Original to download a file
Send this file to firstname.lastname@example.org for analysis and troubleshooting.