How to Strike Through Text in Gmail
Advertisements:Though strikethrough is not a feature that we use in our daily lives unlike bolding or making text italics, it is often required in many cases. For the lesser-known people, strikethrough is a type of styling text with a horizontal line cutting through words representing modification or deliberate deletion. For example: I am was a software engineer (more).

To strikethrough words, we will use the same technique with which we have added HTML and images in Gmail signature i.e. copy and paste from rich text editors. To understand, follow these steps:
Step 1. Write your message in MS Office Word and apply strikethrough to the parts you want.
Step 2. Copy the entire text.
Step 3. Paste it into compose mail window
And you are done. Check out the below illustrative video:
Isnt it a simple thing? But sometimes trivial things give you trouble.