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Hi,

I have tried updated the Thunderbird to v. 24.3.0. From Windows 7, Windows 8, Vista 64 bits, different pcs, different accounts, all have the same problem. Not happened when I sent email to gmail, only to Microsoft exg03 email account, I have this problem. I am going to forwarding an email to you later. Thanks.

Try leaving a space after the =

Thus: = 25%

Where and when did it change? Did it change inside Thunderbird? Did it change in the Sent folder? Or in a reply to you?

= and % are used in certain types of email encoding; =20% often appears, meaning character 0x20 which is 32 denary or the space character. It is often used where an explicit space would be illegal, and this is common in URLs and other links. I'm thinking that =25% similarly has a special meaning. It shouldn't get decoded, but software is buggy.

I can't reproduce it here, which is why I'm asking about how and when it changes. Where does the Microsoft software come into it?

Everything looks find even after sending email on Thunderbird, only when I open the email from the recipient side (I sent email to my exg03 email account for testing), I got the problem. Adding one space after = did not work. = 25% changed to =5%!

= 25% = 39% = 40%

put at least 2 spaces after the = can solve the problem.

= 25% = 39% = 40%

Convert the message to plain text solve the background color change problem and add 2 spaces after = solve the change =25% to %% problem. But please someone fix the bug. Thanks a lot.

I would file a bug, but I just don't have all the details, perhaps you could do it yourself. Bugzilla at https://bugzilla.mozilla.org/