Google is turning on two useful Gmail lab features, “Got the wrong Bob?” and “Don’t forget Bob”, for everyone. These features are meant for helping you to prevent common mistakes – sending a message to the wrong person with a similar name to the person you meant to email & forgetting to include someone on an email.
The feature should start working in all Gmail accounts in coming days. Personally I think, forgetting to include someone on an email is a very common mistake in office correspondence due to urgency of the job.
You can now overcome this.
“as you type in your recipients, Gmail will automatically make suggestions based on the groups of people you email most often. When you see a suggestion to add a person you’ve forgotten, all you have to do is click on their name to add them"
Sending message to unwanted person may cause embarrassment. But it happens rarely because this mistake comes only with similar names.
Next time when you compose a new mail, make note of the above (via)