Sender.php

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<?php
namespace Magento\Config\Model\Config\Backend\Email;

class Sender extends \Magento\Framework\App\Config\Value
{
    public function beforeSave()
    {
        $value = $this->getValue();
        if (!preg_match("/^[\S ]+$/", $value)) {
            throw new \Magento\Framework\Exception\LocalizedException(
                __('The sender name "%1" is not valid. Please use only visible characters and spaces.', $value)
            );
        }

        if (strlen($value) > 255) {
            throw new \Magento\Framework\Exception\LocalizedException(
                __('Maximum sender name length is 255. Please correct your settings.')
            );
        }
        return $this;
    }
}