Howto Add Signature File in Thunderbird
HTML signature files
To make an HTML signature file, write a new message in Thunderbird as though you were about to create a new email but don’t bother with address or subject. Type the text you want for your signature, with whatever formatting and colours you want. Choose File → Save As → File… and save the HTML file. Discard the message.
Alternatively, use some other program to create an HTML file. Name the file with the extension .html, for example: signature.html An HTML signature file only needs to contain an HTML fragment, not a complete HTML document. You can create the file using a plain text editor by typing the HTML tags yourself. Or you can create the file using a special editor that supports HTML.
An HTML signature file uses your operating system’s default character set (which might not be the default character set that you specify for messages in Thunderbird). You can encode special characters using HTML in the normal ways—for example, you can encode a euro currency symbol (€) as € or as €.
Note: Some word processors and HTML editors create HTML documents containing a lot of unnecessary HTML code. You can use a plain text editor to check the file and remove the parts that you do not need.
Including an image in your Thunderbird signature
To include an image in your HTML signature (this won’t work with plain-text signatures), include the image in the message in the normal way.
If the image file is on your computer, then Thunderbird attaches the file in each message that you send, so that people who receive your message can see the image.
If the image is on a web server, then you can choose not to attach the file. However, in this case people who receive your message might not see the image if they choose to block remote images for privacy reasons.
If you create a signature file using some other program, ensure that the image tag contains the complete URL of the image file, not just the file name. Thunderbird requires a complete URL so that it can attach the image.
If you get a “Sending of message failed. There was an error attaching . Please check if you have access to the file” error message you might be running into a bug that changes the path of the image file. Try installing the QuoteAndComposeManager add-on and checking “Try to fix images paths in functions etc” if that occurs.
Removing the Thunderbird signature separator
If you don’t want a “-- ” signature separator (the divider between the message body and the signature) use the config editor to change mail.identity.default.suppress_signature_separator from false to true. This requires Thunderbird 5.0 or later. If you are using Windows go to Tools → Options → Advanced → General and press the Config Editor button. Enter suppress_signature_separator in the Filter: field and press return. Find mail.identity.default.suppress_signature_separator in the results and double click on false in its Value column to toggle it to true, then close the config editor and press the OK button.
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