However, in the real world ESPs accept addresses that are not RFC-valid, and reject addresses that are.
When we built our validator, we did so based on real-world data RFC spec to ensure more accurate validation.
You can test our email validation service for free - just register for a free API key.
We are working with companies like Adobe, Citrix, Autodesk, Salesforce and many others.Protect your sender reputation and try our email verification services for free. In the textbox labeled URL:, enter and then click OK.This will clone Email Validation onto your local machine.A clean mailing list is essential to your email marketing success.
Your email sender reputation - the number of bounces, spam complaints and spam trap hits caused by your mailings - is responsible in 83% of all cases where email does not reach the inbox.
How We Validate Email Addresses Our email validator simply connects to the mail server to ascertain the validity of the email address, verifying whether the email address and username is properly formatted and actually exists.
Our "validate email address" tool is 100% free, superbly fast and very accurate and reliable.
Occasionally you might want to update your local copy of the source code if I have made changes to Email Validation since you downloaded the source code in the step above.
To do this using the command-line version fo Git, you'll need to issue the following command in your terminal within the Email Validation directory: If you are using Tortoise Git on Windows, you'll need to right-click on the Email Validation directory and select Git Sync... Once you do that, you'll need to click the Pull button.
Email Validator will help you steer clear of unwanted or outdated email addresses, spelling errors and will improve your delivery rates.