Seeking PHP-Mailer Expert to Resolve 'Received From:' Header Issues

Job ID: 36927921

Budget: $30 – $250 USD

I'm currently seeking an individual with expertise to address some issues regarding headers in PHP-mailer.

Our infrastructure is composed of a central PHP-mailer server, supplemented by several external servers, each hosting a different SMTP.

However, a problem arises after we input the SMTP details into the PHP-mailer and dispatch an email to a Gmail account: there are numerous "Received from:" fields displayed, thereby revealing our primary server's hostname and IP address.

For a better grasp of this predicament, we've created posts on GitHub and Stack Overflow:

https://github.com/PHPMailer/PHPMailer/issues/2933

https://stackoverflow.com/questions/76737193/multiple-received-from-in-original-message-in-gmail

Responses so far suggest the issue is not resolvable. Nonetheless, I maintain faith that a professional with an in-depth knowledge of PHP-mailer can find a solution.
Related categories: PHP SMTP