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Why are my emails sent through Thunderbird now going into spam/junk folders at the recipients?

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nuklldra
nuklldra
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Within the last two months emails sent through Thunderbird are going into junk folders at some of the recipients. This happens to emails I have sent to people through Thunderbird for years. My web browser is fine, emails from my phone and other servers go through fine, just not Thunderbird. Any ideas why? Thanks.

Within the last two months emails sent through Thunderbird are going into junk folders at some of the recipients. This happens to emails I have sent to people through Thunderbird for years. My web browser is fine, emails from my phone and other servers go through fine, just not Thunderbird. Any ideas why? Thanks.

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Matt
Matt
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The usual reason has something to do with the signature used. Images in signatures especially as the last thing in the email appear to send off some spam filters. Otherwise you might check to see if your domain is blacklisted.

It is not the only block lists, but one of the more popular. https://www.spamhaus.org/