{
  "schemaVersion": 1,
  "slug": "postmark",
  "name": "Postmark",
  "category": "comms",
  "classification": "dedicated",
  "generatedAt": "2026-07-12T14:44:29Z",
  "syncToken": "1783867469",
  "provenance": "https://postmarkapp.com/support/article/800-ips-for-firewalls",
  "sources": [
    {
      "url": "https://postmarkapp.com/support/article/800-ips-for-firewalls",
      "retrievedAt": "2026-07-12T14:44:29Z",
      "sha256": "bc602b1d7c1ae34b7547ff79ce56487fa65cecb6d8d96d604b04083761cbc9f3"
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  "purposes": {
    "smtp": {
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      "ipv4": [
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        "50.31.205.0/24",
        "104.245.209.192/26"
      ],
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    },
    "webhooks": {
      "direction": "ingress",
      "ipv4": [
        "3.134.147.250/32",
        "18.217.206.57/32",
        "50.31.156.6/32",
        "50.31.156.77/32"
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}