Address in mailbox given [] does not comply with RFC 2822, 3.6.2. when email is in a variable

Question

I have a correct email address. I have echoed it, but when I send it, I get the following error:

 Address in mailbox given [] does not comply with RFC 2822,          


        

Answer 1

[SOLVED] Neos/swiftmailer: Address in mailbox given [] does not comply with RFC 2822, 3.6.2

Exception in line 261 of /var/www/html/vendor/Packages/Libraries/swiftmailer/swiftmailer/lib/classes/Swift/Mime/Headers/MailboxHeader.php: Address in mailbox given [] does not comply with RFC 2822, 3.6.2.

private function _assertValidAddress($address)
{
    if (!preg_match('/^'.$this->getGrammar()->getDefinition('addr-spec').'$/D',
        $address)) {
        throw new Swift_RfcComplianceException(
            'Address in mailbox given ['.$address.
            '] does not comply with RFC 2822, 3.6.2.'
            );
    }
}

https://discuss.neos.io/t/solved-neos-swiftmailer-address-in-mailbox-given-does-not-comply-with-rfc-2822-3-6-2/3012