com.postboxservices/postbox-tools
REMOTE · MCP.POSTBOXSERVICES.COM · SCANNED OCT 3
Free email checks: 24 blacklists, spoofing/BEC grade, redirect tracing, email spam test, WHOIS.
Available components
How this component scores in each security and reliability category. Every signal is checked automatically against the live server, and we only credit what we can confirm. How we score → Why this is hard to score →
Endpoint Security83
- The endpoint's TLS certificate is valid, in date, and uses a strong key. View diagnostics → Pass
- No authorisation is required to call this server. Every tool declares its destructiveHint and none is destructive, so open access doesn't expose one. See how to fix → View diagnostics → Partial
- HTTPS is enforced; there's no plaintext access path. View diagnostics → Pass
- The HSTS (Strict-Transport-Security) header is present. View diagnostics → Pass
- DNSSEC is configured correctly; the domain's records validate against the full chain to the root. View diagnostics → Pass
Transport & Reachability100
- Verified streamable-http transport via a live MCP handshake. View diagnostics → Pass
Schema Quality & AI Usability80
- AI-judged instruction clarity (excellent).Pass
- Tool/resource definitions use about 697 tokens (~87/item across 8 items; 8 tools + 0 resources), lean.Pass
- Usage-examples check failed: none of the tools include examples. See how to fix → Fail
Stability & Change Management23
- Stability observed for 7 of 30 days with no destabilising changes; credit accrues until the full window elapses.Partial
Tool Coverage100
- 100% of tools have a non-trivial description (not blank, and not just the tool's name).Pass
- 100% of tool parameters carry a description.Pass
Tool Safety100
- No prompt-injection markers were found in the server instructions, tool names or descriptions we captured.Pass
- We read all 8 captured tool definition(s), and no name or description among them implies an irreversible operation.Pass
- An AI judge read all 9 captured unit(s) of tool text and found none that tries to manipulate the model reading it.Pass
Capabilities100
- Implements a supported MCP spec version (2025-11-25); the latest is 2026-07-28.Pass
How do I install the com.postboxservices/postbox-tools MCP server?
com.postboxservices/postbox-tools is a hosted endpoint at https://mcp.postboxservices.com/mcp, so there is nothing to install locally. Ready-made configuration for Claude, Cursor, VS Code, Codex and 5 more is on this page, copied from each client's own documentation.
remote · mcp.postboxservices.com
claude mcp add --transport http com-postboxservices-postbox-tools 'https://mcp.postboxservices.com/mcp'
{
"mcpServers": {
"com-postboxservices-postbox-tools": {
"url": "https://mcp.postboxservices.com/mcp"
}
}
} {
"servers": {
"com-postboxservices-postbox-tools": {
"type": "http",
"url": "https://mcp.postboxservices.com/mcp"
}
}
} [mcp_servers.com-postboxservices-postbox-tools] url = "https://mcp.postboxservices.com/mcp"
{
"$schema": "https://opencode.ai/config.json",
"mcp": {
"com-postboxservices-postbox-tools": {
"type": "remote",
"url": "https://mcp.postboxservices.com/mcp",
"enabled": true
}
}
} openclaw mcp add com-postboxservices-postbox-tools --url 'https://mcp.postboxservices.com/mcp' --transport streamable-http
mcp_servers:
com-postboxservices-postbox-tools:
url: "https://mcp.postboxservices.com/mcp" {
"McpServers": {
"com-postboxservices-postbox-tools": {
"Transport": "http",
"Url": "https://mcp.postboxservices.com/mcp"
}
}
} assistant mcp add com-postboxservices-postbox-tools -t streamable-http -u 'https://mcp.postboxservices.com/mcp'
{
"mcpServers": {
"com-postboxservices-postbox-tools": {
"type": "http",
"url": "https://mcp.postboxservices.com/mcp"
}
}
} The mcpServers block is a cross-client convention. Remote transports vary, so check your client's docs.
Every change we have recorded for this component, newest first. Security-relevant changes are always shown. ▲ marks a change for the better, ▼ a change for the worse; unmarked changes are neutral.
- 3 Oct 26 +1
No change was recorded against any check on this day. Stability & Change Management went from 20 to 23. That category is still filling its 30-day observation window: 6 days of observed history at the previous scan, 7 at this one. The score rises as the window fills, whether or not the server changes.
- 1 Oct 26 +1
No change was recorded against any check on this day. Stability & Change Management went from 13 to 17. That category is still filling its 30-day observation window: 4 days of observed history at the previous scan, 5 at this one. The score rises as the window fills, whether or not the server changes.
- 28 Sept 26 +7
- We updated how we score, so this day's move reflects our rubric, not a change to the server See what changed → functional
- 27 Sept 26 +1
- Tool “check_blacklist” rewrote its description, which is the text the model reads security
- Stability: unverified → 0.03 ▲ functional
- Server version: 0.1.0 → 0.1.1 functional
- “check_blacklist” reworded the description of “target” cosmetic
- Tool “check_blacklist” changed its title: Email blacklist check (24 DNSBLs) → Email blacklist check cosmetic
- 26 Sept 26 69
First indexed and scored.
Diagnostic detail from the automated scan of this channel: what the scanner observed at each step, so you can see exactly where a check passed or failed. It is informational only and never changes the trust score.
Captured 3 Oct 2026 · Probed https://mcp.postboxservices.com/mcp
TLS valid
Negotiated TLS 1.3 with TLS_AES_128_GCM_SHA256 .
| Subject | Issuer | Valid from | Valid until | Key | Signature | Serial |
|---|---|---|---|---|---|---|
| CN=postboxservices.com | CN=WE1,O=Google Trust Services,C=US | 8 Sept 2026 | 7 Dec 2026 | ECDSA 256 | ECDSA-SHA256 | 5531ce5fdc06a2820e7a51f24b292b35 |
| SANs: postboxservices.com, *.postboxservices.com | ||||||
| CN=WE1,O=Google Trust Services,C=US (CA) | CN=GTS Root R4,O=Google Trust Services LLC,C=US | 13 Dec 2023 | 20 Feb 2029 | ECDSA 256 | ECDSA-SHA384 | 7ff31977972c224a76155d13b6d685e3 |
| CN=GTS Root R4,O=Google Trust Services LLC,C=US (CA) | CN=GlobalSign Root CA,OU=Root CA,O=GlobalSign nv-sa,C=BE | 15 Nov 2023 | 28 Jan 2028 | ECDSA 384 | SHA256-RSA | 7fe530bf331343bedd821610493d8a1b |
Background: What to check on a remote MCP endpoint →
DNSSEC secure
Validation of mcp.postboxservices.com. — Secure
| Zone | DS | Keys | Algorithms | Outcome |
|---|---|---|---|---|
| . | trust_anchor | 20326, 38696 | 8, 8 | Verified |
| com. | present | 19718 | 13 | Verified |
| postboxservices.com. | present | 2371 | 13 | Verified |
| mcp.postboxservices.com. | Verified address RRset verified with the apex keys |
Authentication No authorisation required
The endpoint answered without asking for a token. Anyone who knows the URL can reach it.
| Result | No authorisation required |
|---|---|
| HTTP status | 200 |
| Header | Value |
|---|---|
| strict-transport-security | max-age=31536000; includeSubDomains |
| x-content-type-options | nosniff |
| x-frame-options | SAMEORIGIN |
| referrer-policy | strict-origin-when-cross-origin |
| permissions-policy | geolocation=(), microphone=(), camera=(), payment=(), usb=() |
Background: How OAuth 2.1 works in the 2026 MCP spec →
Transports 2 probes
| Transport | URL | Outcome | Status | Location |
|---|---|---|---|---|
| streamable-http | https://mcp.postboxservices.com/mcp | Verified | 200 | |
| http (plaintext) | http://mcp.postboxservices.com/mcp | HTTPS enforced | 301 | https://mcp.postboxservices.com/mcp |
The tools this component advertises to a client, with an estimated token cost for each. Expand a tool to see its parameters and schema. The per-tool counts are indicative and are not scored directly; the schema's total context footprint is one signal in Schema Quality & AI Usability. A tool's description is untrusted text the model reads on every call, which is what makes this list a security surface and not just an inventory: how tool poisoning works →
analyze_eml Analyze a raw email file (.eml) ~95
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.
| Name | Type | Req | Description |
|---|---|---|---|
| eml | string | yes | The complete raw email source (headers + body), as exported via "Show original" / "Download message" |
No output schema declared.
No examples provided.
check_blacklist Email blacklist check ~99
Check a domain against domain blacklists (Spamhaus DBL, SURBL, URIBL and others), or an IP address against 24 IP blacklists including Spamhaus ZEN, Barracuda and SpamCop. Checks the exact target given: domains are not resolved to IPs. Returns per-list listing status.
| Name | Type | Req | Description |
|---|---|---|---|
| target | string | yes | IPv4 address (checked against IP blacklists) or domain (checked against domain blacklists) |
No output schema declared.
No examples provided.
check_spoofability Spoofing / BEC exposure check (A-F grade) ~71
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.
| Name | Type | Req | Description |
|---|---|---|---|
| domain | string | yes | Domain to grade, e.g. example.com |
No output schema declared.
No examples provided.
create_mailtest Start an email deliverability test ~84
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.
Input schema present but exposes no named parameters.
No output schema declared.
No examples provided.
get_domain_age Domain age lookup ~39
Get a domain's registration date and age (young domains have weak sending reputation).
| Name | Type | Req | Description |
|---|---|---|---|
| domain | string | yes | Domain, e.g. example.com |
No output schema declared.
No examples provided.
get_mailtest_result Get an email deliverability test result ~52
Fetch the score and breakdown of a mail test created with create_mailtest, once the user has sent their email to the disposable address.
| Name | Type | Req | Description |
|---|---|---|---|
| id | string | yes | The test id returned by create_mailtest |
No output schema declared.
No examples provided.
trace_redirect URL redirect chain tracer ~104
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). Fetching is SSRF-hardened (private ranges blocked, HTTPS-only, per-hop validation); how it works: https://redirect.postboxservices.com/
| Name | Type | Req | Description |
|---|---|---|---|
| url | string | yes | Absolute http:// or https:// URL to trace |
No output schema declared.
No examples provided.
whois_lookup WHOIS lookup ~48
WHOIS summary for a domain: registrar, created/updated/expires dates, nameservers, DNSSEC, status flags.
| Name | Type | Req | Description |
|---|---|---|---|
| domain | string | yes | Domain, e.g. example.com |
No output schema declared.
No examples provided.
What is the com.postboxservices/postbox-tools MCP server?
com.postboxservices/postbox-tools is an MCP server listed in the public MCP registry as com.postboxservices/postbox-tools. Free email checks: 24 blacklists, spoofing/BEC grade, redirect tracing, email spam test, WHOIS. This page covers its hosted endpoint (https://mcp.postboxservices.com/mcp).
Is the com.postboxservices/postbox-tools MCP server safe to use?
com.postboxservices/postbox-tools scores 79 out of 100 on VerifyMCP. That is a record of what we were able to check automatically, not an endorsement. The category breakdown on this page shows every signal behind the number, including the ones we could not confirm.
What tools does the com.postboxservices/postbox-tools MCP server expose?
com.postboxservices/postbox-tools exposes 8 tools: check_blacklist, check_spoofability, trace_redirect, create_mailtest, get_mailtest_result, and 3 more. Their descriptions and schemas cost roughly 592 tokens of context every time the server is loaded.
Does the com.postboxservices/postbox-tools MCP server require authentication?
No. We connected to com.postboxservices/postbox-tools without credentials and it answered, so anything it exposes is reachable by anyone who knows the address.
Is the com.postboxservices/postbox-tools MCP server still maintained?
com.postboxservices/postbox-tools is still listed as active in the MCP registry. We last reached this channel on 3 October 2026. Those dates come from our own scans of the registry and the channel itself, not from anything the publisher announced.