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When I send an email to someone it always says SPAM in the subject line. I know this because I "c.c." the message to myself and it says SPAM. How to stop this?

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When I send a email to someone it always says SPAM in their subject line. I know this because I "cc" or b.c.c myself on important messages and when the "cc" or "bcc" comes back, it will say [SPAM] in front of whatever else I had written in the subject line to the intended recipient. How can I stop the word SPAM from showing up in the subject line of my own outgoing messages? I don't want the recipient delete my message thinking it is spam. Help!

When I send a email to someone it always says SPAM in their subject line. I know this because I "cc" or b.c.c myself on important messages and when the "cc" or "bcc" comes back, it will say [SPAM] in front of whatever else I had written in the subject line to the intended recipient. How can I stop the word SPAM from showing up in the subject line of my own outgoing messages? I don't want the recipient delete my message thinking it is spam. Help!

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The 'SPAM' tag is not in the message you sent. It is added when you receive the message, either from your provider's spam filter on the server, or some sort of anti-virus/anti-spam s/w on your computer.

Check the settings for both.

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Could you check whether [SPAM] appears on the subject line if you view your messages directly on the server (for example, using a webmail page in your web browser)? This will help distinguish an accusation coming from a web server vs. any spam filter you may have installed on your computer that examines the mail while Thunderbird retrieves it.