Pedro, I can easily reproduce it over and over again with these two conditions:
1) The email is sent from a Gmail account to Nabble
2) The email sent from Nabble is viewed in Outlook 2007
Many of my members have the same problem. So it's not just me. I get the same results on my laptop (viewing the emails Outlook) and also if I send my email from Gmail using multiple browsers..
But even if yours is displaying correctly in your email program and you can't see the Âs, you should still be able to see the difference in encoding - which is what is driving this problem.
Here is a test that clearly shows the problem occurs when going through Nabble. If I send an email to both the forum and myself from my Gmail account. The copy I get directly to myself is properly encoded with UTF-8 and displays fine. The copy I get that goes thru Nabble is encoded with us-ascii (Windows) and has the  symbols.
So let me do that same test with you. I'm going to post a new email to the forum AND copy you on it as well.
Look at the HTML for the email that comes directly to you (I'm sure you know this, but to see the HTML in Gmail select the down arrow next to the reply arrow and select "Show Original"), search for charset. You will see the encoding is as follows:
Content-Type: text/plain; charset=UTF-8
Now look at the HTML for the copy that went thru Nabble - you will see the encoding is as follows:
Content-Type: text/plain; charset=us-ascii
So Gmail sent it as UTF-8 (I can see that in my sent email folder on Gmail) and when Nabble gets the email, processes it and sends it out again, it sends it out with charset=us-ascii. If this is corrected to send out in UTF-8 then this problem should go away. I'm actually surprised you've not run across this problem more frequently with the different languages you support. But maybe Nabble sets the charset properly for those different languages (as it does seem to set it correctly to utf-8 when including a special character somewhere in the email)
I certainly have learned a lot about encoding from this problem. This article: The Absolute Minimum Every Software Developer Absolutely, Positively Must Know About Unicode and Character Sets (No Excuses!) by Joel Spolsky <http://www.joelonsoftware.com/articles/Unicode.html> has good explanation of why you'd see different things in different email programs.
Let me know what you see from these tests.
Coleen
Coleen Astalos, Stampin' Up! Demonstrator
Alamosa, CO, [hidden email]
See my website at http://alamosa.stampinup.net
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From: Pedro <Nabble> [via Nabble Support] [mailto:[hidden email]]
Sent: Wednesday, January 22, 2014 1:18 PM
To: Coleen_Astalos
Subject: RE: Posts going thru Gmail have funny  symbol
I'm trying different approaches. But I couldn't reproduce this bug yet. Can you test on another pc and browser?
My test forum.
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NAML
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