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How To – Android Authority
The username part of an email address can sometimes have numbers and special characters. But what if someone gives you an email address with a combination of upper-case and lower-case letters? Will that email address work if you send it an email? Or does all of the email address need to be lower-case? In other words, are email addresses case-sensitive? This vitally important question in the internet world will now be answered.
Read more: What to do if your Gmail is not receiving emails
