Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

When I use backspace to correct spelling errors in an email, the person I'm sending email to gets upside down question marks and other characters in the place

  • 7 replies
  • 2 have this problem
  • 14 views
  • Last reply by Toad-Hall

more options

Sending email to friend and I backspace to correct a spelling error. To my friend I sent the email to, he gets an upside down ? mark and other characters in the spot where I used a backspace. Is there a way to correct that? Here is an example copy/pasted here: (and asked if she had heard anything about David.��)

Sending email to friend and I backspace to correct a spelling error. To my friend I sent the email to, he gets an upside down ? mark and other characters in the spot where I used a backspace. Is there a way to correct that? Here is an example copy/pasted here: (and asked if she had heard anything about David.��)

Chosen solution

Sadly some US ISP's like AT&T and Bellsouth have started *corrupting* their customers' e-mail. If the you send using Encoding windows-1252 and includes for example special punctuation characters or a non-break space xA0, the ISP doesn't correctly interpret the the message as windows-1252 but as UTF-8. In UTF-8, xA0 is not valid and gets replaced by the so-called replacement character, � (0xEF 0xBF 0xBD).

Since the e-mail is still windows-1252 encoded, the recipient's client displays �.


Workarounds:

Set preference mail.strictly_mime to true.


Try this: 'Menu icon' > 'Options' > 'Display' > 'Formatting' tab click on 'Advanced' button

Set Unicode on both Outgoing and Incoming Check box "When possible, use the default text encoding in replies" click on OK

report back on : what text encoding you are using for incoming and outgoing mail. Was the checkbox When possible, use the default text encoding in replies" selected or not?

Read this answer in context 👍 1

All Replies (7)

more options

Chosen Solution

Sadly some US ISP's like AT&T and Bellsouth have started *corrupting* their customers' e-mail. If the you send using Encoding windows-1252 and includes for example special punctuation characters or a non-break space xA0, the ISP doesn't correctly interpret the the message as windows-1252 but as UTF-8. In UTF-8, xA0 is not valid and gets replaced by the so-called replacement character, � (0xEF 0xBF 0xBD).

Since the e-mail is still windows-1252 encoded, the recipient's client displays �.


Workarounds:

Set preference mail.strictly_mime to true.


Try this: 'Menu icon' > 'Options' > 'Display' > 'Formatting' tab click on 'Advanced' button

Set Unicode on both Outgoing and Incoming Check box "When possible, use the default text encoding in replies" click on OK

report back on : what text encoding you are using for incoming and outgoing mail. Was the checkbox When possible, use the default text encoding in replies" selected or not?

more options

Wow! I just tested it and your solution(s) worked! Thank you very much! NO, the checkbox "when possible, ue the default text encoding in replies" was not checked. I then checked it.

I'm not sure where the "preference mail.strictly_mime is to set it to true, but doesn't matter..the other solutions fixed it! Thanks!!

more options

this is really strange now! something has happened to change things. My settings are still the same and the upside down ? marks have gone away but for each time I use the backspace key, the ? becomes 2 question marks right side up (??) where I used the backspace key.

more options

Applied the fix but now ? comes back right side up. What does mail.strictly_mime to true mean? and how to I do that?

more options
  • Menu icon > Options > Advanced > 'General' tab
  • click on 'Config Editor' button
  • In search type: mime
  • This line: 'mail.strictly_mime'
  • double click on the line to toggle the Value 'false' to a 'True'
  • close window - top right X
  • click on 'OK'
  • Restart Thunderbird.

Modified by Toad-Hall

more options

My menu doesn't exactly look the same as you listed above, for example I was looking for a "search" but finally figured out that it was "config" and then type in "mime", etc., etc. Thank you so much! I would not have ever figured out how to get to this point without this last bit of information. I tested it after I did the fix and now it does work completely!

more options

You were correct - my mistake - I've updated the answer I gave, so if someone else locates it they will not be confused.