postbox-tools
Free email checks: 24 blacklists, spoofing/BEC grade, redirect tracing, email spam test, WHOIS.
使うべきか
品質と安全性
ツール定義とプロトコルへの準拠に関する自動分析に基づいています。
コンテキストコスト
これは、サーバーのツールがモデルのコンテキストに読み込まれるたびに消費されるおおよそのトークン数です。数が多いほど、ほかのタスクに使える注意が減ります。
インストール
ワンクリックインストール
これを `claude_desktop_config.json` ファイルに追加してください:
{
"mcpServers": {
"postbox-tools": {
"url": "https://mcp.postboxservices.com/mcp"
}
}
}リモートエンドポイント
https://mcp.postboxservices.com/mcpstreamable-httpできること
ツール一覧
ツール（8）
🟢check_blacklist(target)
Check a domain (its mail-relevant IPs) or a single IP address against 24 DNS blacklists including Spamhaus ZEN, Barracuda and SpamCop. Returns per-IP listing status. Free tool by Postbox Services.
入力スキーマ
{
"type": "object",
"properties": {
"target": {
"type": "string",
"description": "Domain (example.com) or IPv4 address to check"
}
},
"required": [
"target"
],
"additionalProperties": false,
"$schema": "http://json-schema.org/draft-07/schema#"
}🟢check_spoofability(domain)
Grade how exposed a domain is to email spoofing and business email compromise, from its public DNS (SPF, DMARC policy strength, alignment, live lookalike domains). Returns an A-F grade with findings. Free tool by Postbox Services.
入力スキーマ
{
"type": "object",
"properties": {
"domain": {
"type": "string",
"description": "Domain to grade, e.g. example.com"
}
},
"required": [
"domain"
],
"additionalProperties": false,
"$schema": "http://json-schema.org/draft-07/schema#"
}⚪trace_redirect(url)
Follow a URL server-side through every HTTP redirect hop to its real final destination - per-hop status, IP, TLS and timing, plus phishing/deliverability flags (cross-domain jumps, https downgrades, meta/JS redirects). Free tool by Postbox Services.
入力スキーマ
{
"type": "object",
"properties": {
"url": {
"type": "string",
"description": "Absolute http:// or https:// URL to trace"
}
},
"required": [
"url"
],
"additionalProperties": false,
"$schema": "http://json-schema.org/draft-07/schema#"
}🟡create_mailtest
Create a disposable test address for a full email deliverability audit (score /10: SPF, DKIM, DMARC + alignment, blacklists, reverse DNS, SpamAssassin content, Gmail/Yahoo bulk-sender compliance). The USER must then send an email from the system they want to test to the returned address, after which get_mailtest_result returns the score. Free tool by Postbox Services.
入力スキーマ
{
"type": "object",
"properties": {},
"$schema": "http://json-schema.org/draft-07/schema#"
}🟡get_mailtest_result(id)
Fetch the score and breakdown of a mail test created with create_mailtest, once the user has sent their email to the disposable address.
入力スキーマ
{
"type": "object",
"properties": {
"id": {
"type": "string",
"description": "The test id returned by create_mailtest"
}
},
"required": [
"id"
],
"additionalProperties": false,
"$schema": "http://json-schema.org/draft-07/schema#"
}🟡analyze_eml(eml)
Run a deliverability/content analysis on a raw RFC 822 email (.eml source: full headers + body). IMPORTANT LIMITS: with no live SMTP session, SPF, blacklist and reverse-DNS cannot be verified from a file - for the authoritative score use create_mailtest instead. Free tool by Postbox Services.
入力スキーマ
{
"type": "object",
"properties": {
"eml": {
"type": "string",
"description": "The complete raw email source (headers + body), as exported via \"Show original\" / \"Download message\""
}
},
"required": [
"eml"
],
"additionalProperties": false,
"$schema": "http://json-schema.org/draft-07/schema#"
}🟢get_domain_age(domain)
Get a domain's registration date and age (young domains have weak sending reputation). Free tool by Postbox Services.
入力スキーマ
{
"type": "object",
"properties": {
"domain": {
"type": "string",
"description": "Domain, e.g. example.com"
}
},
"required": [
"domain"
],
"additionalProperties": false,
"$schema": "http://json-schema.org/draft-07/schema#"
}⚪whois_lookup(domain)
WHOIS summary for a domain: registrar, created/updated/expires dates, nameservers, DNSSEC, status flags. Free tool by Postbox Services.
入力スキーマ
{
"type": "object",
"properties": {
"domain": {
"type": "string",
"description": "Domain, e.g. example.com"
}
},
"required": [
"domain"
],
"additionalProperties": false,
"$schema": "http://json-schema.org/draft-07/schema#"
}コミュニティ
エビデンス