IPs for Firewalls

Below is a list of IPs you'll want to add to your firewall for sending email through our API and SMTP.

API Access

  • 50.31.156.109
  • 34.192.253.140
  • 50.31.165.246

SMTP Endpoints (for using SMTP outbound service)

    CIDR Blocks / Ranges

  • 147.75.195.176/30 [147.75.195.176 - 147.75.195.179]
  • 147.75.202.84/30 [147.75.202.84 -147.75.202.87]
  • 147.75.205.84/30 [147.75.205.84 - 147.75.205.87]

Inbound SMTP Servers (where our inbound MX record points)

  • 147.75.197.171
  • 147.75.197.173
  • 147.75.108.21
  • 147.75.108.7
  • 147.75.99.133
  • 147.75.108.15

Webhooks (inbound, bounce, open, etc)

  • 50.31.156.6
  • 50.31.156.77 (new)
  • 18.217.206.57 (new)

Outbound SMTP Servers (where we send email from)

  • 50.31.156.96/27 (50.31.156.96 - 127)
  • 104.245.209.192/26 (104.245.209.192 - 255)
  • 50.31.205.0/24 (50.31.205.1 - 255)
Last updated December 4th, 2018

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