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How Determine actual email address of Fake Email Address?

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How do I determine the actual email address of a sender when they are using a fake email address that prevents message filtering? I have been using message filtering for years, but one email address never gets filtered. My filter is set to move the message to the junk folder. I have also filtered by using portions of the email address and using the "contains" option. AOL has a "details" link that allows me to see the actual email address of fake email addresses, so I hope Thunderbird is at least as capable as AOL. P.S.: Why doesn't Thunderbird allow blocking emails instead of this laborious filtering method that takes hundreds of filtered emails for it to learn? AOL does.

How do I determine the actual email address of a sender when they are using a fake email address that prevents message filtering? I have been using message filtering for years, but one email address never gets filtered. My filter is set to move the message to the junk folder. I have also filtered by using portions of the email address and using the "contains" option. AOL has a "details" link that allows me to see the actual email address of fake email addresses, so I hope Thunderbird is at least as capable as AOL. P.S.: Why doesn't Thunderbird allow blocking emails instead of this laborious filtering method that takes hundreds of filtered emails for it to learn? AOL does.

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Control+u shows source code..

No email client software can block anything. They just download messages from your providers server. Trying to filter spam using addresses is a losing battle. Use Thunderbird Junk controls. Check with your provider for any options they may have.