Can you provide a screenshot?

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Thank you!

Hello Fabian thank you for reaching out, it took me a long time to figure out the screen shot. I am still having problems really hope you can help I am attaching a screen shot now. You will see the added question marks which are created when I use the space bar or tab key.

THe come from two sources.

1. Wrong character encoding. Go to the view menu under the three bar application menu on the top right select Character encoding and change it to something else. try Unicode if it is not set to that. It is usually set to western when this occurs.

2. a sub standard mail server. Yahoo made a mess of things recently until they reverted a change. Uncommon and requires to to make permanent changes to Thunderbird that may have similar effects on other messages.

Hi Matt that didn't fix the problem.

western was printing upside down question marks,  unicode was a black triangle with question mark inside.  I tried other options but thy were all giving me weird symbols. 

could you suggest something else or please call me 415 786 5552.

hello I am still having the same problem with weird fonts.

As you can see my out going and sometimes receiving emails back to they have weird fonts Western was printing upside down question marks, and Unicode was a black triangle with question mark inside. Can someone please help me? or call me 415 786 5552

I have just uploaded images of me emails.

Thanks for your patience, I still think Matt had the right answer, perhaps just lacking specific details. Keep in mind this will probably not make existing email display right, only new emails. Perhaps test again AFTER you've done the following:

Go to Tools > Options > Display > Formatting and click on Advanced… on the right under Fonts & Colors. Now choose Unicode (UTF-8) as text encoding for both incoming and outgoing mail.

ref: https://support.mozilla.org/en-US/questions/1197969

Thank you Fabian, your directions to fix the problems were better. There seams to be many paths to change the fonts but only one way is the correct way. Thank you currently everything looks OK.

I am glad this helped, thanks for your patience in following all guidance and sharing back the results here.

Don't hesitate to come back if you have any other questions in the future.

Cheers,

Fabian