To investigate Gmail sender

In the Gmail, click on the “down arrow” on the right side of the Reply, it will show a list of item. Click on the “Show original”.

A new page will show the coding in HTML format.

Just press “CTRL-A” (hold the Control key, and then press A) to select all the text, then CTRL-C to copy.

In the email content, press CTRL-V to paste these HTML coding.

Send to me to investigate.