I use filters to remove some undesirable messages (in addition to the intergrated spam filter). This is great to avoid tons of boring people who want to sell me tons of boring stuff.

My problem is, since years (so with every Thunderbird release I ever had, even the current one which is up to date) it is unable to filter links.
For example I want to delete every messages containing a link to http://xxxxx.emv3.com/xxxxxx
I never managed to remove those emails. I use a filter on the body, checking if it contains emv3 but this never match. Those emails are in HTML format, and the links are displayed as a text like "Visit our website" or so.

If I write a HTML email with a link, my filter works.
When this is a spam, this never works.

When I save the email to a text file, I open it with notepad and I see several http://xxxxx.emv3.com/xxxx

Any idea why this don't work ?
And how can I do ?