Usernames often contain both upper-case and lower-case letters and may also contain numbers, underscores, or periods.

Does Case Matter?

Mostly No

Is recipient@example.com the same as Recipient@EXAMPLE.com as far as email servers are concerned?

A person choosing between two email addresses, one with capital letters

Lifewire / Theresa Chiechi

Lifewire / Theresa Chiechi

Google email addresses ignore the letter case and periods.

For example, jsmithe@gmail.com is the same as j.smithe@gmail.com.

Not many email services or ISPs enforce case-sensitive email addresses.