During sending mails on a Plesk Server with Postfix, I recognized that my "Drupal registration mails" have been rejected from GMail.
I have a multi site setup on a Plesk Server with several different domain names. Postfix is using a default sender name and not the configured mail name on the website due to a missing "Return-Path"-Header.
In the "MimeMailFormatHelper.php" the header "Return-Path" is changed from default_from to from if from is configured.
The problem is, that from is not an E-Mail address. It's a sender name like a company name or website name.
But the "Return-Path" in the header needs to be an E-Mail address.
I created a patch to solve the problem by using the default_from value.
Please Review and comment. If ok please consider the fix in the next release.
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Closed: duplicate
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It's likely this issue predates Contrib.social: some issue and comment data are missing.
As I said, $from is always an email address. The two things you give as examples are explicitly site names - general text fields - and are not used for the Return-Path.
Marking this as a duplicate of 🐛 RfcComplianceException: RFC 2822 Needs work