Following Bounce Messages can appear in the Bounce-Record:
* 420 Connection timeout
* 421 E-Mail temporary not deliverable
* 441 Receiving mailserver communication failure
* 447 Receiving mailserver unreachable
* 452 Mailbox over quota
* 500 Receiving mailserver blocks delivery
* 512 Domain error
* 515 Wrong address format
* 550 Recipient unknown
* 570 Rejected due to spam detection
* 700 Configuration error
* 4401 Send timeframe exceeded
* 4402 Secure connection (TLS) failed
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