Attaching documents to outgoing emails in Mozilla Thunderbird
In this tutorial you will learn how to attach documents to outgoing emails using Mozilla Thunderbird.
Step-by-step instructions
Open Mozilla Thunderbird.
To create a new email, single-left-click the 'New Message' to the top left.
Older versions of Thunderbird makes use of a 'Write' button.
You will be met with a new email dialog. To attach a document, single-left-click on the 'Attach' button to the top right of the new email dialog.
On Microsoft Windows you will be met by Windows Explorer, the default File Manager. From here you will have to browse (search for) the document or file you wish to attach.
Once located, you will have to single-left-click-select the document you wish to attach to the email, and then single-left-click the 'Open' button to the bottom right of the dialog.
The document will now be attached to your email. Simply add a recipient and message.
Troubleshooting
If you encounter issues, ensure that the file is not too large and is in a supported format.
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References
Mozilla Support (2016a, June 7) How to use attachments [Mozilla Support] https://support.mozilla.org/en-US/kb/how-use-attachments
Mozilla Support (2024, May 10) Send and open attachments in Thunderbird [Mozilla Support] https://support.mozilla.org/en-US/kb/send-and-open-attachments-thunderbird
📅 September 4, 2025
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