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Recipients of my emails receive random multiple question mark symbols in their messages. Why!

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Lately, when we send our emails by "Thunderbird" the recipients receive random question mark symbols (which I did not type) in their messages. I cleaned up the keys of my keyboard( a vintage Microsoft unit). My keyboard is ok. When I send the same type of messages through my Gmail or another account, the above-noted question marks do not appear. I could change my email provider ,however I am looking for a less dramatic solution to the problem.

Lately, when we send our emails by "Thunderbird" the recipients receive random question mark symbols (which I did not type) in their messages. I cleaned up the keys of my keyboard( a vintage Microsoft unit). My keyboard is ok. When I send the same type of messages through my Gmail or another account, the above-noted question marks do not appear. I could change my email provider ,however I am looking for a less dramatic solution to the problem.

Chosen solution

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Additional System Details

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  • User Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; Trident/7.0; .NET4.0C; .NET4.0E; .NET CLR 2.0.50727; .NET CLR 3.0.30729; .NET CLR 3.5.30729; InfoPath.3; ASJB; rv:11.0) like Gecko

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jscher2000
  • Top 10 Contributor
8568 solutions 70051 answers

Chosen Solution

Check out the solution in this thread: https://support.mozilla.org/questions/1257880

Check out the solution in this thread: https://support.mozilla.org/questions/1257880
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Question owner

I believe that you have solved my annoying"question mark" problem and I am very pleased with the results. I would never have been able to fix this problem without your assistance. Thank you.

I believe that you have solved my annoying"question mark" problem and I am very pleased with the results. I would never have been able to fix this problem without your assistance. Thank you.
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