As mentioned in my subject line - Emails Sent from Thunderbird are marked as spam and get sent straight to junk. I have tested sending them to another email I own and they are not even delivered - they immediately go straight to the spam/junk box on my server. I have exhausted all of the options I can think of - for example: Double checking all of my settings Contacting my email host provider and ensuring there were no issues their end I have correct DKIM and SPF records setup and checked by my host I have changed my IP address (Twice) and checked these for blacklists (spamhaus etc...) I tested sending from the web based email portal and they work fine. I then decided to try another email client as my hosting company said that Thunderbird may be causing the issue - I have now tried 2 other clients (Outlook and Windows Mail) and the emails are delivered fine so my conclusion is that it a Thunderbird issue. I would like to continue using Thunderbird but if my emails are going to junk/spam this is obviously not an option! Please can anyone help shed some light on this or provide a solution? Thanks