Strange SPAM

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I use Thunderbird for email. My filters have been working fine and all
has been well until about 6 months ago. On an email account that is
reserved for very limited communication with a select few, I
inadvertently use it to send a message to a less computer literate
friend. She saved it and despite my request to delete it, she retains it
(though she thinks I think it's gone). I suspect someone got hold of
here address list and my special email address is one it. No matter what
I do, I cannot filter out emails that contain a strange character.
Here's an example:

In desperation, I've begun looking for another email program. I stumbled
upon "Mailwasher". It claims to be compatible with Thunderbird and
appears to have the capability of blocking mail such as the above...
though I thought Thunderbird was capable as well.

Can anyone tell me anything about this character embedded type email,
how correct I may be about getting on there list, and if I'm moving in
the right direction with "Mailwasher"?

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