Most email programs do not support the use of all characters, especially ‘smart quote’ characters that Word and other programs auto-insert as you type. According to Microsoft:
This always happens when you are using characters (Such as apostrophes, double quotes, dashes, and ellipsis).
Solution: When creating your email subject line, DO NOT copy and paste your text – instead, hand-type your subject line into the ‘Subject Line’ text box.
Here is an example of what bad characters look like when used in a subject line:
Original text, copied from Word and pasted into the subject line:
Check out CorpNote’s “wonderful” outing. Play Frisbee™ and don’t ‘forget’ shoes!
When sent, the email subject line appears like this to your recipients:
Check out CorpNoteâ€™s â€œwonderfulâ€ outing. Play Frisbeeâ„¢ and donâ€™t â€˜forgetâ€™ shoes!
The same subject line, hand typed, with standard (‘straight’) quotes, and no ‘TM’ looks like this, and will work correctly:
Check out CorpNote's "wonderful" outing. Play Frisbee and don't 'forget' shoes!