If you have a long list of emails, you can evaluate whether these emails are even real or not, using the ISEMAIL function. Suppose we have a list of emails in cell range A2:A5 in a given spreadsheet.

How to create a drop-down list in Google Sheets Your email has been sent Inconsistent data can create problems in Google Sheets. A misspelled word, an inaccurate ...

Follow the steps below to create a drop-down list using data validation in Excel. If you want to add a message pop up, you can click the Input Message tab and check the checkbox for “Show input ...

Data validation is one of the most effective ways to protect Web applications from attack. Ensuring only the data you expect is entered into a form or provided via some other input mechanism should be ...