Description
Using Swiftmailer we can see the Headers and it's important to note that the original receiver (X-Swift-To: thomas.lallement@9online.fr) have been replaced by the receiver provided in dev env (To: tlallement@incert.lu).

Using Symfony Mailer we don't have the headers displayed on first tab, even if the title appears. We can think that the mail is really sent to the To: thomas.lallement@9online.fr even if in fact it have been really sent to tlallement@incert.lu (using the RCPT TO header).

Even in the Raw tab we are not able to see the real receiver. Is it normal?

Example
No response