When you send an email to your own colleagues, or contacts within your list who have the same domain as your sender email address, these emails may be marked as spam by your business email firewall.
To ensure that your emails still arrive successfully, we recommend that you work with your IT team to add the following IP ranges as safe senders. This will resolve the issue.
| CIDR | Start of range | End of range |
| 173.236.20.0/24 | 173.236.20.2 | 173.236.20.254 |
| 192.92.97.0/24 | 192.92.97.2 | 192.92.97.254 |
| 52.128.40.0/21 | 52.128.40.0 |
52.128.47.255 |
| 217.8.118.0/24 | 217.8.118.0 | 217.8.118.255 |