Google's Gmail is a free e-mail service that offers many formatting options for your messages. One option that it doesn't offer is strikethrough, which puts a line through text as if it has been crossed out. While strikethrough isn't offered by Gmail, it's supported if pasted from another source. You can use a word processing program to obtain the strikethrough text, and then add it to your Gmail message.
Log in to your Gmail account and click the "Compose Mail" button on the left of the screen.
Write your e-mail up to the point where you want strikethrough text.
Open a new file in a word processing program.
Write the text that you want to be strikethrough.
Highlight the text and click "Strikethrough." On most programs, click "Format," "Font," and then click "Strikethrough" from the font menu. Some programs have an icon in the toolbar that you can click without having to go through the font menu; it usually depicts letters with a line through them.
Highlight the text. Hold "Ctrl" and "C" to copy the text and "Ctrl" and "V" to paste it into the Gmail message. The strikethrough formatting will be preserved.
Complete your message and send it.