Are email address case sensitive? NO, Here’s why

Hi myself Prem, I have worked as Microsoft 365 Support Ambassador and in this blog I will talk about “are email address case sensitive” in general.


Email addresses can end with domains like,,, etc. One can setup email address ending with their own domain as well.


If you have any custom domain, you should be able to create email address with it using email service from any email service provider.


Microsoft 365 is one of the email providers that can be used to add a custom domain and then create as many email addresses you want.


Few things that we should know about email addresses:

Are email address case sensitive: The answer to this is No, the email addresses are not case sensitive.

For example, if you want to send email to, then it does not matter if you type ABC@ABC.COM or or ABC@abc.COM, etc. in the To field of the email.

Are email address case sensitive

The recipient, should still be able receive the email which you have sent to them.


Email addresses are mostly presented in the all small letter format, so the ideal looking email address would be in terms of the above example.


In office 365, you can add many custom domains and then create many email addresses with it.


If you are looking to create a office 365 tenant from scratch then you can refer our YouTube Channel.


Useful Link Regarding Email setup in Office 365:

Verify and connect domain in office 365


Create user in Office 365


Create shared mailboxes in Office 365


How to create user with same name but different domain in Office 365



The answer to the question, Are email address case sensitive, is “No”, email addresses are not case sensitive.


Do let me know if you have any question regarding office 365 in the comment section below.


Date: 11/09/2023

Author: Prem

Tag: Are email address case sensitive

Leave a Comment

Your email address will not be published. Required fields are marked *