Email address with non-ASCII local part passes validation but fails with AWS error

[danatemple]

I'm not an expert on whether this should be the case, but e.g.

dån@example.com

passes validation with RFCValidation() but is then rejected by the AWS SES API:

<Error>
    <Type>Sender</Type>
    <Code>InvalidPara (truncated...)
 InvalidParameterValue (client): Local address contains control or whitespace - <ErrorResponse xmlns="http://ses.amazonaws.com/doc/2010-12-01/">
  <Error>

This is with release 4.0.4 on a Laravel 12 framework vanilla email validation setup.

Maybe that address is not strictly wrong acc to the RFC (I don't know?), but the end result is a bit problematic. Any solutions?

[egulias]

Hi there!
As you have correctly the email is RFC valid (you can find similar ones in the test suite).
That being said, you can choose from here https://github.com/egulias/EmailValidator?tab=readme-ov-file#available-validations the NoRFCWarnings. That one should throw ìnvalid for your example.
Sadly I cannot help with how is that implemented in Laravel.
I hope it helps!
Cheers!

[danatemple]

Sorry, should have mentioned that I did also try the NoRFCWarnings but that also evaluated as valid.

There seems to be a missing validator "emails that are accepted by major cloud services". It would appear to be the "There are non-ASCII characters in the email address" test that is being failed.
https://docs.aws.amazon.com/ses/latest/dg/troubleshoot-error-messages.html

I'm a bit surprised to be discovering this as Laravel use AWS for their Vapor and Cloud services and use your validator out-of-the-box for form validation.
In your opinion, is this just an AWS "quirk" or are these emails in fact invalid according to some standard?

[egulias]

Thanks for the additional information @danatemple
Is very common for email servers to only accept ASCII.
The way to solve it is to implement your own validation by implementing this interface https://github.com/egulias/EmailValidator/blob/4.x/src/Validation/EmailValidation.php and then adding it to the mix.

<?php

use Egulias\EmailValidator\EmailValidator;
use Egulias\EmailValidator\Validation\MultipleValidationWithAnd;
use Egulias\EmailValidator\Validation\RFCValidation;

use Your\Own\Validation\OnlyASCIIValidation;

$validator = new EmailValidator();
$multipleValidations = new MultipleValidationWithAnd([
    new RFCValidation(),
    new OnlyASCIIValidation()
]);

$validator->isValid("dån@example.com", $multipleValidations); //false

Caution: order is important.
Don't panic, given your requirement, just testing the whole email for a-zA-Z0-9 (etc, or "just ascii" Regex command) but check for what non-ASCII really stands for, you might find some ASCII chars are not supported (for instance, whitespace :) ).

Extra ball
A PR with said validator would be awesome 🥇

[danatemple]

Thanks, this is really useful! I'm not really an expert in this area but I'll take a look at what a practical filter should look like. I'm sure someone must have already done this.