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Thunderbird rate my reply messages as spam

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When I send some messages in Thunderbird they are stopped as spam, which they are not! In most cases I cannot answere an incoming mail by using the reply function but must set up a new mail. Telia, my mail server provider in Sweden, has no outgoing spam filter. I can send any type of mail or reply mail from my Telia Webmail but not by using Thunderbird. I have used Thunderbird for more than 15 years without problems. This problem started one month ago. What kind of setting can solve this problem?

When I send some messages in Thunderbird they are stopped as spam, which they are not! In most cases I cannot answere an incoming mail by using the reply function but must set up a new mail. Telia, my mail server provider in Sweden, has no outgoing spam filter. I can send any type of mail or reply mail from my Telia Webmail but not by using Thunderbird. I have used Thunderbird for more than 15 years without problems. This problem started one month ago. What kind of setting can solve this problem?

All Replies (2)

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Thunderbird does nothing with regard to outgoing messages being considered SPAM. You compose it and Thunderbird sends it. Some antivirus and internet security suites however do mess with outgoing mail and try and make themselves useful by blocking legitimate mail as SPAM.

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Thanks, you are right! I removed the AVG Free antivirus program and then my Thunderbird works without problems. Thanks for your advice!