Bug Report - AWS SES - Email as case sensitive

Question

I was working in AWS SES for the last days, and I found a strange behavior on the identity validation and the email sending function (related to case-sensitive email).
Basically, as I'm working on sandbox, the recipient email must be validated.
So, I created an identity and I successfully validated the email `"user.name@example.com"` (it's an example).

After that, I tried to send an email using **AWS SDK for JavaScript**, with **nodemailer** (using SES as provider) to the email: `"User.Name@example.com"` and I received the following message: *`"Email address is not verified. The following identities failed the check in region XX-XXXX-X: User.Name@example.com"`*.

To verify if the **case sensitive** was the problem, I tried again using the recipient email as `"user.name@example.com"` and it works!

Is it a bug or this is the expected behavior?
I guess that it could be a strange behavior because emails are not case-sensitive.

*RequestID: 09427677-c13b-44d1-9bdc-be9941697413*

Thank you,
Lucas.

jsonc · Answer

Great catch, Lucas.

This is expected behavior by AWS.  As noted on https://docs.aws.amazon.com/ses/latest/DeveloperGuide/verify-email-addresses.html for email verification, email addresses are case sensitive and the email cannot be used unless the case matches what was verified.

The example AWS gives is sender@EXAMPLE.com vs sender@example.com.

Bug Report - AWS SES - Email as case sensitive

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