Domain with MX record localhost marked as possible to accept emails

[UstyuzhaninAV]

Email to check

gaasd@we.de

From where did you run check-if-email-exists?

self hosted backend api

Version of check-if-email-exists (if running it yourself)

lastone

What happened?

Look please one issue, domain for example gaasd@we.de has MX record localhost
and all emails must be mark as invalid
but it's mark as unknown and "accepts_mail": true with is wrong.

Relevant log output

"input": "gaasd@we.de",
  "is_reachable": "unknown",
  "misc": {
    "is_disposable": false,
    "is_role_account": false,
    "gravatar_url": null,
    "haveibeenpwned": null
  },
  "mx": {
    "accepts_mail": true,
    "records": [
      "localhost."
    ]
  },
  "smtp": {
    "error": {
      "type": "SmtpError",
      "message": "io: Address not available (os error 99)"
    }
  },
  "syntax": {
    "address": "gaasd@we.de",
    "domain": "we.de",
    "is_valid_syntax": true,
    "username": "gaasd",
    "normalized_email": "gaasd@we.de",
    "suggestion": null
  },

[EmreKaplaner]

I can confirm this issue for example@foo.com as well, it is categorized as unknown but should have been invalid: "is_reachable":"unknown","misc":{"is_disposable":false,"is_role_account":false,"gravatar_url":null,"haveibeenpwned":null},"mx":{"accepts_mail":true,"records":["0.0.0.0."]},"smtp":{"error":{"type":"SmtpError","message":"io: Connection refused (os error 111)"}}; 0.0.0.0. is not a valid record. So, there is currently an issue with the overall MX record validation.