{
  "id": 5911969,
  "title": "Gmail bounced everything the relay sent: three broken auth mechanisms and a silent OpenDKIM",
  "url": "https://urgent.news/2026/09/06/gmail-bounced-everything-the-relay-sent-three-broken-auth-mechanisms",
  "topic": "tech",
  "section": "Tech",
  "published": "2026-09-06T05:11:15.000Z",
  "source": {
    "name": "Dev.to",
    "slug": "dev-to",
    "url": "https://dev.to/bitpage/gmail-bounced-everything-the-relay-sent-three-broken-auth-mechanisms-and-a-silent-opendkim-1cgl"
  },
  "original_language": "en",
  "account": "Three fundamental issues caused Gmail to reject the relay's emails: a missing SPF record, incorrect PTR record, and OpenDKIM not signing the emails. The domain lacked a v=spf1 record, the PTR resolved to a different server, and OpenDKIM failed to sign the emails due to KeyTable and SigningTable being attached as refile. The Postfix server on a legacy container also had incorrect InternalHosts configuration, and the mail log did not reveal any DKIM-Signature. To resolve the issues, the PTR needed to be changed to match the A record, Postfix myhostname should match the PTR, and the SPF record should be corrected.",
  "summary": "Short answer: Three independent mechanisms were broken at once, and fixing any one of them changed nothing visible. The domain had no v=spf1 record (only a dead SenderID one), the PTR resolved forward to a different server, and OpenDKIM was signing nothing because KeyTable and SigningTable were attached as refile: while their contents were in plain two-column format. That last one cost the most…",
  "key_points": [
    "Gmail rejected emails due to missing SPF record",
    "PTR record incorrect, resolving to different server",
    "OpenDKIM failed to sign emails, KeyTable and SigningTable issues"
  ],
  "editors_take": "Gmail's rejection of the relay's emails highlights the importance of proper email authentication mechanisms, including accurate SPF and PTR records, and correct DKIM signing configurations.",
  "illustration": null,
  "coverage": {
    "outlets": 1,
    "also_reported_by": []
  },
  "ai_generated": true,
  "disclaimer": "Summaries, key points and the editor’s take are written by software from other outlets’ reporting and may contain errors — always check the linked original."
}