Are Email Addresses Case Sensitive

I was helping one of my colleagues with a company’s publication. Before we send the documents for press printing, I saw an uncommon way of email address written in the contacts section. It was written:

Sales@example.com

I never really take note of email address with uppercase character until I help my colleague with those sets of documents. Can email server rejects Sales@example.com if the username “Sales” was not created but rather “sales” was created. I got rather worried if the email server will bounce or reject the username “Sales”. I did a quick test by sending an email using the character with uppercase and it works!

We can always experiment with other set of email address. Use a different email provider and send to your own Yahoo mail or other email accounts you are holding. If your email address is alexandra111@yahoo.com, compose a test mail and send using ALEXandra111@yahoo.com instead of alexandra111@yahoo.com, you should able to receive the email in Yahoo. I tried mine and it works

Found another sets of answer using Google with the phrase “uppercase email address”. A question regarding email address case sensitive was raise in About.com. Heinz Tschabitscher the author explains that case typically does not matter. He went on mentioning that email service provider does not strictly requires case sensitive email addresses. If you type your recipient email address in uppercase, the provider will still accept it.

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