All the info you mention indicated that you are using HTML and attaching a document. '''Q:''' What is the purpose of the automated reply? If it one you want to use because eg: you are away from the office ? I would recommend you do not use Thunderbird. This should be set up via your webmail account accessed by using your browser. Why? Because you would need to leave your computer permanently switched on and logged into your User Account and thunderbird would need to be running. None of the above is exactly secure as anyone with access to that computer would get to see anything including all senstive and private data. re : ''and tons of extra text at the bottom,'' That is the attachment. Clearly, that sounds like the reply filter is still using an incorrect template email. Check your 'Templates' folder for old or not required template emails and delete them. then right click on 'Templates' folder and select 'Compact' to remove all 'marked as deleted' emails. Then recheck the filter to see which template it is using and modify as required. If you are trying to set up a filter that detects a specific email and in that instance performs an auto reply using a template then do the following. Open 'Write' Create new email and save as Template. Note the 'Subject' you enter will help you choose the correct template in the filters. Do not use the same data in 'Subject' as any other stored Template email. * Menu icon > Message Filters > MessageFilters * click on 'New' * type suitable filter name such as 'Reply-auto' Apply filter when: * select 'Getting new mail' * select 'Match all of the following' if setting only one condition or if setting more than one but both must be true. OR * select 'Match any of the following' if setting more than one condition and either could be true. example: * 'From' and 'Contains' and type email address Perform these actions: * 'Reply with Template' and choose the Template (which is based on email 'Subject') * click on 'OK Note: filters at the top run first, so if filter is further down the list and another filter higher up acts on that email, then subsequent filters will not run. * Enable the filter. '''Q:''' What settings do you have in this location: 'Menu icon ' >'Options' > 'Options' > 'Display' 'Formatting' tab click on 'Advanced' button Post image of 'fonts & encodings' window. Also post image showing the settings you have for sending: 'Menu icon ' >'Options' > 'Options' > 'Composition' > 'General' tab click on 'Send Options' button see image See my settings in image below