When reading emails in Thunderbird, the contents of the "From" column are taken from the email's "From:" header. Since anything can be put in the "From:" header, I have tried (and failed) to teach some of my less tech savvy users not to trust it. I often see emails coming from random freemail addresses that are "From: The CEO". Therefore, I would like Thunderbird to completely ignore the "From:" header and use something else instead.
What I would like to do is to show the contents of the "Return-Path:", "X-Sender" or "X-Envelope-From" header. I don't mean that the name of the column has to be "From", it could be an add-on that adds a new column.
Basically, my situation is the following:
I am using Thunderbird 38.5.1 and always update to the latest version on release
I am using Getmail 4.46.0 to fetch mail from Bell Canada via megamailservers.com
A user recently received a phishing email that had the following headers:
Return-Path: <[email protected]> <---- this is what I want to see
X-Envelope-From: [email protected] <---- this is what I want to see
From: "CEO's name" <CEO'[email protected]> X---- I want to ignore this
X-Sender: [email protected] <---- this is what I want to see
Reply-To: "CEO's name" <[email protected]>
To: [email protected]
"Return-path" is added by the sender's MTA and seems like a good candidate since most phishers are using either freemail or compromised email accounts and have no control over the setting of this header.
"X-Sender" and "X-Envelope-From" I think are added by my MTA and are probably just copied form the "Return-Path".
Unfortunately, despite the incorrect reply-to, the spam warning from spamassassin and the general wrong-ness of the message tone, the recipient fell for the phish with disastrous consequences.
Although no one in management is doubting that the recipient was completely at fault, I would feel better if I could take away the easy "it's from this person" "From" field. It may force enough of a pause in the recipient's thinking to realize that something is off.
Unfortunately, this is easier said than done for some reason.
I have tried several extensions, namely Mnenhy and Show Address Only both of which sounded like they did what I wanted but ended up just using the "From:" header anyways. It's possible that I did something wrong, of course, but they didn't seem to do the trick.
What I am looking for is any menu setting, config editor setting or extension that will allow me to display the contents of the "Return-Path:", "X-Sender" or "X-Envelope-From" headers in the list view (and, ideally, in the "From" field once the email is displayed).
Unfortunately, despite...the spam warning from spamassassin
The user just "figured" that the spam warning was a mistake and clicked through to get to the message.