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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.

Outbound SMTP Servers #

The IP addresses that Transactional and Broadcast messages are sent 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)

API Access #

  • 50.31.156.109
  • 34.192.253.140
  • 50.31.165.246
  • 18.216.134.80 [New]
  • 3.137.63.180 [New]

SMTP Endpoints #

The IP endpoints for accessing SMTP outbound.

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]
  • 52.79.88.220
  • 54.180.186.193
  • 34.249.162.51
  • 52.208.184.61
  • 63.35.51.189
  • 3.208.98.158
  • 3.93.205.235
  • 3.95.122.1
  • 3.208.98.158
  • 3.93.205.235
  • 3.95.122.1
  • 13.209.189.43
  • 15.164.159.110
  • 52.208.94.138
  • 52.210.34.36
  • 54.77.222.65

Inbound SMTP Servers #

These IPs are where Postmark's inbound MX record points.

  • 13.58.75.120
  • 52.36.8.247
  • 18.221.96.15
  • 34.211.250.229
  • 34.211.88.250
  • 18.221.180.145
  • 52.210.157.196
  • 52.213.211.243
  • 52.51.73.41
  • 13.125.126.102
  • 3.34.204.228
  • 3.34.213.247
  • 107.22.71.110
  • 52.2.5.255
  • 72.44.42.226

Webhooks #

These IPs apply for every webhook sent by Postmark (inbound, bounce, open, etc).

  • 3.134.147.250 (New - added 9/15/2020)
  • 50.31.156.6
  • 50.31.156.77
  • 18.217.206.57
Last updated September 15th, 2020

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