Emails get sent out as raw HTML on PHP 8 on Acquia - Send email as HTML - EmailWebformHandler.php

Hello @bernardm28,
is it possible to see this error enabling email debugging?
If yes, can you attach a webform example or add the steps to repoduce?
Btw are you testing it with the last webform dev version?

I don't see any difference in a small test that did.

Confirming this does not happen on Mailhog; however on Acquia this happens. I needed to revert back to PHP 7 and it works now. I will report my findings here.

I will set this back to maintainer needs more info (even though I'm not the maintainer!).

@bernardm28 what was the environment you had issues with?

Here is the message I got from my Acquia support ticket:

I've submitted a report of this to my team so we can begin triaging this issue, as it is likely a fault at the platform-level; I don't think that there are any workarounds for this and PHP 8 at this time.

Unfortunately I don't have a way to provide an ETA for a fix on this, but you should be able to get around this by swapping PHP versions, if that is possible for you.

So if anyone uses Webform on Acquia and is considering moving to PHP8, make sure you test the forms on the staging environment before moving your production site to PHP8.

I will document herein any more information I get from Acquia.

This is not really a Webform bug at this point. Setting to "support request" instead.

Thanks @bernardm28

If "platform-email" works, please document it here.

Specifying that this is a potential Acquia issue with Webform in the issue title.

I am including some more info here, although I'll leave it at "postponed", as I am unable to reproduce this in isolation. According to Acquia:

In PHP 8.0 there was a change to only explode email headers only on CRLF where previously it was exploded on LF and CRLF: https://github.com/php/php-src/commit/6983ae751cd301886c966b84367fc7aaa1...

The email headers aren’t exploded correctly in Drupal core and since the headers with 8.0 don't separate, Content-Type won't get parsed and so the email will present itself as raw text.

Here is the code in Drupal core:

core/lib/Drupal/Core/Mail/Plugin/Mail/PhpMail.php#92:

    // For headers, PHP's API suggests that we use CRLF normally,
    // but some MTAs incorrectly replace LF with CRLF. See #234403.
    $mail_headers = implode("\n", $mimeheaders);

This looks like a Drupal Core issue that is affected by the linked PHP8 change, and is probably dependent on the receiving MTA too (That's why it might be working with mail-hog, but not in the production environment).

For me this happens only (on PHP 8) with twig template emails, not with default ones.

I use swiftmailer for formatting, when also using swiftmailer as sender/transport, the emails using twig templates are no longer plain text.
BTW symfony_mailer will be the successor for swiftmailer, which is no longer maintained ... not yet tested though.

@alberto56, you can close this issue for the Acquia email issues. We (BernardM28 and I) have implemented Acquia Platform Email and tested/verified with PHP 8 in our dev, stage and prod environments. Acquia has deprecated their legacy mail services and require all clients to migrate to Acquia Platform Email.

• https://docs.acquia.com/cloud-platform/manage/platform-email/

Note: for Acquia Platform Email, the From: address of any email message must be associated with a verified email hostname with Acquia's required DNS SPF, CNAME and DKIM records. e.g. for our application, no-reply@cloudmail.domain.tld. We have changed all of our webform email handlers to use that From: address, and added appropriate Reply-to: addresses to the handlers.

Was able to get it to work just by adding a space to a core file.

D 9.4.5
PHP 8.1.8
WebForm 6.1.3
Was getting the same issue. PHP 7.4 worked fine sending an HTML email from WebForm. Switched to PHP 8.1 and the HTML was no longer formatting correctly in the received email. Checked the headers for the issue that people say prevented it (a space being added to the beginning of content-type, etc.), and sure enough, those spaces were there. They can be removed in the core file:

/core/lib/Drupal/Core/Mail/Plugin/Mail/PhpMail.php

Line 104, add a space AFTER the \r\n and it works!
Before:
$mail_headers = str_replace("\r\n", "\n", $headers->toString());
After:
$mail_headers = str_replace("\r\n ", "\n", $headers->toString());

#20 sorts this issue out for me.

Still not fixed as of Drupal 9.4.6

D 9.4.8
PHP 8.1.8
WebForm 6.1.3
Was getting the same issue.

PHP 7.4 worked fine sending an HTML email from WebForm

The related issue looks like a better place to resolve this

#3270647: PhpMail : broken mail headers in PHP 8.0+ because of LF characters

#20 works for me.

#20 works very well

Got hit with this again.

This time on an installation using Drupal's PhpMailer. I can confirm patch #20 works.

But - I would recommend to follow #3270647: PhpMail : broken mail headers in PHP 8.0+ because of LF characters in core for a future-proof solution.
Currently, I'm using https://www.drupal.org/files/issues/2022-10-31/3270647-32.patch