Mails rejected for some subscribers since version 6.9.9

[dsaal]

Hello,
Since version 6.9.9 (and up to version 7.0.1) some subscribers do not received emails because they are rejected for spam policy. That concern users with email managed by sfr.fr.

SMTP error from remote server for TEXT command, host: smtp-in.sfr.fr (93.17.128.165) reason: 550 5.7.1 Email rejected per SPAM policy

Everything works fine if I switch back to version 6.9.8.

Is it possible to know what has been changed since version 6.9.9 that can cause this problem.

Best regards

[dsaal]

I can see in the release notes that x-mailer has been removed since 6.9.9. Maybe that is what is causing the problem. Is there a way to re-activate the x-mailer in order to make a test and see if the reject is linked with that

Regards

[dsaal]

I would like to confirm that for me the problem I am facing is linked with the x-mailer.
I downloaded version 7.0.1 and commented one line in the file mailer.php in the includes folder.

Original line
$this->mailer->XMailer = ‘ ‘; // A space!

Modified line
/* $this->mailer->XMailer = ‘ ‘; // A space!
*/

And with this change my mails are not rejected anymore

Best regards

[Author]

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