Suppressing automatically-generated links
It is possible to take some steps to suppress automatically-generated links, but you cannot completely suppress them.
Sending messages
When you write an HTML message, you can suppress automatically-generated links. Select the text that Thunderbird normally linkifies. Choose Insert – HTML... In the HTML editor, type anchor tags around the text. For example, if you type this but you do not want Thunderbird to linkify it:
someone@example.org
In the HTML editor, change it to:
<a>someone@example.org</a>
If there is already an anchor tag with attributes (class and href, typically), then remove the attributes to leave the tag looking like the example above.
Note: People who receive your message might still see a link, if they use mail clients that linkify when they display messages. For example, Thunderbird users will probably see a link if they choose: View – Message Body As – Plain Text
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