{
  "is": "issue",
  "title": "German SMTP blocked by Microsoft",
  "body": "\u003cp\u003e\u003cem\u003eFixed\u003c/em\u003e - We\u0026rsquo;ve still not received confirmation from Microsoft that the block was lifted, but we\u0026rsquo;ve seen no further blocking activity since 23:50 UTC on 20 December 2021 so we consider this incident to be closed. \n  \u003cspan class=\"faded\"\u003e(15:42 UTC — Dec 23)\u003c/span\u003e\n\n\u003c/p\u003e\n\u003cp\u003e\u003cem\u003eWatching\u003c/em\u003e - Microsoft began accepting mail from smtp.de.opalstack.com as of 23:50 UTC on 20 December 2021.\u003c/p\u003e\n\u003cp\u003eWe\u0026rsquo;re still awaiting official confirmation that the block has been lifted. \n  \u003cspan class=\"faded\"\u003e(15:27 UTC — Dec 21)\u003c/span\u003e\n\n\u003c/p\u003e\n\u003cp\u003eOn December 18 2021 at 19:30 UTC Microsoft began blocking mail sent from smtp.de.opalstack.com to domains that use the Microsoft 365 email system.\u003c/p\u003e\n\u003cp\u003eMicrosoft\u0026rsquo;s own IP reputation and junk mail reporting systems indicate that there are no problems with smtp.de.opalstack.com so we\u0026rsquo;ve reached out to them for answers.\u003c/p\u003e\n\u003cp\u003eWe\u0026rsquo;ll update this post as soon as more information is available.\u003c/p\u003e\n\u003cp\u003eIn the interim as a possible workaround customers may create a new mailbox on our US mail server and use that temporarily for their outgoing email authentication. \n  \u003cspan class=\"faded\"\u003e(19:30 UTC — Dec 18)\u003c/span\u003e\n\n\u003c/p\u003e\n",
  "createdAt": "2021-12-18 19:30:00 +0000 UTC",
  "lastMod": "2021-12-18 19:30:00 +0000 UTC",
  "permalink": "https://opalstackstatus.com/issues/2021-12-18-german-smtp-blocked-by-microsoft/",
  "severity": "down",
  "resolved": true,
  "informational": false,
  "resolvedAt": "2021-12-23 15:42:49",
  "affected": ["SMTP (DE)"],
  "filename": "2021-12-18-german-smtp-blocked-by-microsoft.md"
}