Question marks are being added to messages sent through Yahoo servers

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If question marks are being inserted into messages sent through Yahoo, AT&T, AOL, or Verizon servers, this is due to a server bug that causes 8BITMIME to be incorrectly returned as 8 BITMIME.

To work around this in Postbox, try these three steps in sequence, testing after each step (you don't want to do all three unless you need to):

1) Go to Preferences | Options > Composition > General and set the Character Encoding to "UTF-8." 

2) If this still doesn't work, select the checkbox for Use the default character encoding in replies in that same panel.

3) Go to Preferences | Options > Advanced > General and select the checkbox for MIME encode 8-bit headers.

For an in-depth analysis of what's happening, please see this Mozilla article.

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