Hello there vicjackson. We have read your message. We try to help you. The from e-mail-address appears double. Do you think it s a spam? By what thought? https://support.mozilla.org/en-US/kb/thunderbird-and-junk-spam-messages Does it send emails twice? Thunderbird's popular junk filtering tools have been updated to stay ahead of spam. Every email you receive passes Thunderbird's industry-leading spam filters. Whenever you mark messages as spam, Thunderbird "learns" from it and improves its filters, giving you more time to read email that's relevant. Thunderbird may also use your email provider's spam filters to keep unwanted messages out of your inbox. https://support.mozilla.org/en-US/kb/organize-your-messages-using-filters Double the senders name could be it is a system defined rule. Greetings Firefox volunteer.