Overview
Cordial uses an MTA email provider called Mailgun. This article includes Mailgun-provided bounce numbers (BN), bounce classification (BC), and bounce type (BT).
Bounce numbers, classifications, and types
Mailgun will generate the following bounce numbers, bounce classifications, and bounce types when there are deliverability issues.
Some of these system events may change over time. Data prior to 2/12/2025 may have values and formats from Cordial's previous email provider.
| Bounce number (BN) | Bounce classification (BC) | Bounce type (BT) |
|---|---|---|
221 |
generic | hard |
413 |
generic | soft |
421 |
generic, greylisted, ratelimit | soft |
422 |
generic | soft |
440 |
generic | soft |
450 |
bounce, espblock | hard |
450 |
generic, greylisted | soft |
451 |
generic, greylisted | soft |
452 |
generic | hard |
452 |
generic, espblock | soft |
453 |
generic | soft |
454 |
generic | soft |
457 |
generic | soft |
459 |
generic | soft |
471 |
generic | soft |
475 |
generic | soft |
498 |
generic | hard |
499 |
generic | soft |
500 |
generic | hard |
501 |
bounce | hard |
503 |
generic | hard |
511 |
bounce | hard |
521 |
generic | hard |
522 |
generic | hard |
525 |
generic | hard |
530 |
generic, bounce | hard |
535 |
generic | hard |
540 |
bounce | hard |
541 |
generic | hard |
542 |
generic | hard |
543 |
generic | hard |
550 |
generic, blacklisted, bounce, espblock | hard |
550 |
generic | soft |
551 |
generic, bounce | hard |
552 |
generic, bounce | hard |
553 |
generic, blacklisted, bounce | hard |
554 |
generic, blacklisted, bounce, espblock | hard |
555 |
generic | hard |
556 |
generic | hard |
557 |
generic | hard |
558 |
generic | hard |
571 |
generic | hard |
591 |
generic | hard |
602 |
old | soft |
612 |
generic | hard |
615 |
generic | soft |
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