GitLab

Reproduce:

1. Enable Tax and Invoicing (in "CiviContribute Component Settings")
2. Setup a From-Email-Adress
3. Create a Contribution
4. Use "Email Invoice" to send an Invoice.

You get: "Validation failed for: from-email-address"

The reason could be found in CRM/Contribute/Form/Task/Invoice.php[460:465]:

$fromEmail = CRM_Core_BAO_Email::getFromEmail();

// from email address
 if (isset($params['from_email_address'])) \{
 $fromEmailAddress = CRM_Utils_Array::value($params['from_email_address'], $fromEmail);
 }

The values of $fromEmail are html-escaped versions of the email-adresses. They might be useful for Select-Options in HTML-Forms. But they won't work for real email-headers.