When an email returns a soft bounce, Heysender will attempt to resend the email over the following 100 hours. If failing continues until the final attempt, the soft bounce will result in being converted to a hard bounce.
The retry intervals is as follows:
| Delivery Attempt | Seconds | HH:MM:SS |
|---|---|---|
| 1 | 0 | 00:00:00 |
| 2 | 400 | 00:06:40 |
| 3 | 1600 | 00:26:40 |
| 4 | 3600 | 01:00:00 |
| 5 | 6400 | 01:46:40 |
| 6 | 10000 | 02:46:40 |
| 7 | 14400 | 04:00:00 |
| 8 | 19600 | 05:26:40 |
| 9 | 25600 | 07:06:40 |
| 10 | 32400 | 09:00:00 |
| 11 | 40000 | 11:06:40 |
| 12 | 48400 | 13:26:40 |
| 13 | 57600 | 16:00:00 |
| 14 | 67600 | 18:46:40 |
| 15 | 78400 | 21:46:40 |
| 16 | 90000 | 24:00:00 |
| 17 | 102400 | 28:26:40 |
| 18 | 115600 | 32:06:40 |
| 19 | 129600 | 36:00:00 |
| 20 | 144400 | 40:06:40 |
| 21 | 160000 | 44:26:40 |
| 22 | 176400 | 49:00:00 |
| 23 | 193600 | 53:46:40 |
| 24 | 211600 | 58:46:40 |
| 25 | 230400 | 64:00:00 |
| 26 | 250000 | 69:26:40 |
| 27 | 270400 | 75:06:40 |