When sending B2B emails (to business email addresses), you may encounter deliverability problems caused by the recipient company’s firewall.
To improve the deliverability of your B2B emails, we recommend that you contact the IT department of the concerned company and ask them to whitelist the following IP ranges and domains:
- 220.127.116.11/20 that can be understood as 4,096 IPs from 18.104.22.168 to 22.214.171.124 (latest IP range)
- 126.96.36.199/24 that can be understood as 256 IPs, from 188.8.131.52 to 184.108.40.206
- 220.127.116.11/24 that can be understood as 256 IPs, from 18.104.22.168 to 22.214.171.124
🤔 Have a question?
If you have a question, feel free to contact our support team by creating a ticket from your account. If you don't have an account yet, you can contact us here.