Improve bounce match by including MsgId in bounce address

[Wouter0100]

As I currently understand, the bounced e-mail should contain the X-Postal-MsgID header that was sent with the original e-mail. I now however got a bounce from gmail, where this is left out.

Wouldn't it be possible to use plus addressing (or some other way of combining server token + MsgID) in the bounce e-mail address? This way we always know the MsgID, as it is sent to that bounce address.

The bounce e-mail address would then look something like: {server.token}+{MsgID}@{bounce prefix}.{domain}