Invalid header value detected

[kestraly]

When sending to non UTF-8 customer names, the error is Invalid header value detected

To fix edit file
Sendinblue/Sendinblue/Model/Transport.php

Within public function sendMessage()

Find each instance of
$zend_mail = Message::fromString($this->_message->getRawMessage());

Add directly underneath
$zend_mail->getHeaders()->get('to')->setEncoding('utf-8');

[devphoenix2404]

Hi @kestraly
after implementing this solution, did it worked for you?

[kestraly]

@devphoenix2404 - yep, resolved it perfectly