Solution: Not sure of exact line number, but look for this line (around 1972): $server_arr = [$this->smtpDomain]; and above it, add: $this->smtpHost = $this->smtpDomain; Andy
550 Bad HELO - Host impersonating
Very creative, looking into it for a permanent fix.
DKIM not working and needed possibly for GMAIL recipients
Fixed the PHPMailer Pro website and added create_dkim_keys.zip utility to the files download section.
Errors using PHP 8.2
Examples show the changes. PHPMailer Pro is NOT code compatile with PHPMailer.
MIME error