TO_EXCESS_QP warning from RSPAMD or SpamAssassin

[bupy7]

Bug Report

Version: 2.14.1

Summary

For example, we have the follows code:

$builder = new \Laminas\Mail\Message();
$builder->setEncoding('UTF-8');

$builder->setFrom(['from@example.com' => 'Sender Name']);
$builder->setTo(['to@example.com' => 'Recipient Name']);

From and To headers will looks like:

From: =?UTF-8?Q?Sender=20Name?= <from@example.com>\r\n
To: =?UTF-8?Q?Recipient=20Name?= <to@example.com>\r\n

But some email validation services (RSPAMD or SpamAssassin) gives to us a warning "TO_EXCESS_QP: To that contains encoded characters while quoted-printable is not needed as all symbols are 7bit", because the strings "Sender Name" and "Recipient Name" has ASCII compatibility already. So, without direct fix in Laminas\Mail\Header\AbstractAddressList::getFieldValue() has no any ability do not encode those strings always.

I would like do not encode ASCII compatibility strings without any reasons.

From: Sender Name <from@example.com>\r\n
To: Recipient Name <to@example.com>\r\n

Therefore, I think, the fix should looks like

public function getFieldValue($format = HeaderInterface::FORMAT_RAW)
{
    // ...
    
    if (!empty($name) && preg_match('/^[[:ascii:]]+$/', $name) !== 1) {
        $name = HeaderWrap::mimeEncodeValue($name, $encoding);
    }
    
    // ...

The same problem was in Symphony CMS symphonycms/symphonycms#2858

Current behavior

Name of email encode always.

How to reproduce

See summary section.

Expected behavior

Do not encode name of email without necessary.

[Slamdunk]

Hi, can you propose a PR with a correlated test for this?
That would be very much appreciated 💪

[bupy7]

@Slamdunk Hi!
I would like to, but the problem is not at To/From headers only. For the other headers the encoding may be not necessary either. HeaderWrap::mimeEncodeValue() using by many different places, therefore, the library need to refactor the all. It's a big work and, for some reasons, the better option will use the PHPMailer library, that respect necessary of encoding.