Missing characters can occur due to several reasons:
Encoding Issues: Different email clients may use different character encodings. If your email is encoded in a format not supported by the recipient's email client, it can lead to missing characters. HTML/CSS Errors: Mistakes in your HTML or CSS code can cause characters to disappear or not render properly. Copy-Paste Problems: Copying and pasting content from a word processor or another source can introduce hidden formatting issues. Font Compatibility: The chosen font may not support certain characters, causing them to be omitted or replaced with placeholders.