Unable to send mail on Magento 2.2.8 with Arabic or Persian locale as Sender Name

[tuyennn]

Preconditions (*)

1. Magento 2.2.8
2. Persian or Arabic set as main locale

Steps to reproduce (*)

1. Set sender Name for General Email a Persian or Arabic Name. Ex: نام فرستنده
2. Well to send any email as Welcome or Order confirmation

Expected result (*)

1. Email should be sent correctly without any issue

Actual result (*)

1. Error exception throw: Invalid header value detected
2. All mails failed to sent

[m2-assistant]

Hi @tuyennn. Thank you for your report.
To help us process this issue please make sure that you provided the following information:

• Summary of the issue
• Information on your environment
• Steps to reproduce
• Expected and actual results

Please make sure that the issue is reproducible on the vanilla Magento instance following Steps to reproduce. To deploy vanilla Magento instance on our environment, please, add a comment to the issue:

@magento-engcom-team give me 2.3-develop instance - upcoming 2.3.x release

For more details, please, review the Magento Contributor Assistant documentation.

@tuyennn do you confirm that you was able to reproduce the issue on vanilla Magento instance following steps to reproduce?

• yes
• no

[tuyennn]

@magento-engcom-team give me 2.3-develop instance

[magento-engcom-team]

Hi @tuyennn. Thank you for your request. I'm working on Magento 2.3-develop instance for you

[magento-engcom-team]

Hi @tuyennn, here is your Magento instance.
Admin access: https://i-22778-2-3-develop.instances.magento-community.engineering/admin
Login: admin Password: 123123q
Instance will be terminated in up to 3 hours.

[tuyennn]

@magento-engcom-team confirmed issue on 2.3-develop instance No welcome email, order confirmation email.
Though from Magento 2.2.8 and Magento 2.3 the Zend Mail 1 was not exist and changed by Zend Mail 2 lib, in some kind the validation of Header was failed during mail send.

[tuyennn]

zendframework/zend-mail#221
zendframework/zend-mail#97

[m2-assistant]

Hi @AlexWorking. Thank you for working on this issue.
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[tuyennn]

After debugging

vendor/zendframework/zend-mail/src/Header/HeaderValue.php

/**
     * Determine if the header value contains any invalid characters.
     *
     * @see    http://www.rfc-base.org/txt/rfc-2822.txt (section 2.2)
     * @param string $value
     * @return bool
     */
    public static function isValid($value)
    {
        $total = strlen($value);
        for ($i = 0; $i < $total; $i += 1) {
            $ord = ord($value[$i]);

            // bare LF means we aren't valid
            if ($ord === 10 || $ord > 127) {
                return false;
            }

            if ($ord === 13) {
                if ($i + 2 >= $total) {
                    return false;
                }

                $lf = ord($value[$i + 1]);
                $sp = ord($value[$i + 2]);

                if ($lf !== 10 || ! in_array($sp, [9, 32], true)) {
                    return false;
                }

                // skip over the LF following this
                $i += 2;
            }
        }

        return true;
    }

Just found out my Sender name was exceed int the ASCII value 127 characters and the validation was return false.

[mugua]

@tuyennn I met the same issue using chinese words, how do you fix it ?
Mine: Magento 2.3.2+SMTP:Amasty
Thanks very much.