Best way to mask emails? Is a third party program or add-on (like Blur) the best way to go?
None needed, I think,
Chosen solution
Thunderbird, nor any other email client, cannot do what you want. It will call on a server to actually post the message and in the overwhelming majority of cases, that server will expect the "from:" address to be a real address, and it will embed its own details into the message.
You do need the services of that man-in-the-middle server to do the obfuscation if you're communicating directly by email. But in forum posts it's common for the sender's email address to be redacted. We don't show them here on this forum, for instance.
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"Mask emails"?
I'm guessing that you're talking about making email addresses unreadable in a screenshot?
I use The Gimp or Irfanview.
That actually is something I should have thought of, but didn't, thanks. I was thinking more of a way not to have email adresses "out there" and therefore accessible to others. I think Blur does this with an intermediate server, assigning a random sender address and then dispatching the email forward. I have found this comforting when dispatching emails via websites.
Chosen Solution
Thunderbird, nor any other email client, cannot do what you want. It will call on a server to actually post the message and in the overwhelming majority of cases, that server will expect the "from:" address to be a real address, and it will embed its own details into the message.
You do need the services of that man-in-the-middle server to do the obfuscation if you're communicating directly by email. But in forum posts it's common for the sender's email address to be redacted. We don't show them here on this forum, for instance.