GET
$0.01 default
/checkDescription
Email authentication posture check: parses SPF, DMARC and DKIM plus MX for any domain and grades deliverability/anti-spoofing gaps (SPF +all, SPF >10 lookups, DMARC p=none, missing DKIM). Clean JSON for deliverability and security-ops automation.
Pricing
$0.01 default
Parameters
{
"properties": {
"domain": {
"description": "Domain to check — hostname only, no scheme/IP literal, no trailing dot, no localhost, no local/internal/reserved suffix (.local, .internal, .localdomain, .lan, .test)",
"maxLength": 253,
"pattern": "^[A-Za-z0-9-]{1,63}(\\.[A-Za-z0-9-]{1,63})*$",
"type": "string"
},
"selector": {
"description": "Optional DKIM selector to check authoritatively; if omitted, a common-selector list is probed",
"type": "string"
}
},
"required": [
"domain"
],
"type": "object"
}Example response
{
"accepts_mail": true,
"dkim": {
"checked_selectors": [
"default",
"google",
"selector1",
"selector2",
"k1",
"dkim",
"mail"
],
"found": [
{
"record": "v=DKIM1; k=rsa; p=MIGfMA0GCSq...",
"selector": "google"
}
]
},
"dmarc": {
"adkim": "s",
"aspf": "s",
"pct": 100,
"policy": "reject",
"record": "v=DMARC1; p=reject; pct=100; rua=mailto:dmarc@example.com; adkim=s; aspf=s",
"rua": [
"mailto:dmarc@example.com"
],
"ruf": [],
"subdomain_policy": ""
},
"domain": "example.com",
"mx": [
{
"host": "aspmx.l.google.com.",
"pref": 1
}
],
"queried_at": "2026-07-02T12:00:00Z",
"spf": {
"all_qualifier": "~all",
"dns_lookups": 1,
"mechanisms": [
{
"causes_dns": true,
"kind": "include",
"qualifier": "+",
"value": "_spf.google.com"
},
{
"causes_dns": false,
"kind": "all",
"qualifier": "~",
"value": ""
}
],
"record": "v=spf1 include:_spf.google.com ~all"
},
"warnings": []
}