Qualisend verifies email addresses and cleans lists in real time to protect deliverability and sender reputation. Ask an agent to check a single address, a batch, or a whole list. Qualisend runs the full pipeline (syntax, domain/MX, disposable, role, catch-all, and a live SMTP mailbox probe) and returns a deliverable / risky / undeliverable / unknown verdict with a 0-100 confidence score. Tools (12) - `verify_email` - verify one address - `verify_emails` - verify a ba - `verify_list` - verify a whol - `get_credit_balance`, `get_ves and look up past results - `check_domain`, `generate_dnseader`, `check_disposable`,`check_typo`, `lookup_smtp_code` - deliverability tools (Pro plan) - `check_blacklist` - blacklist / DNSBL checks (Blacklist Monitoring add-on) Auth: OAuth 2.1 (connect wi no key copying) or an API key.New accounts get 100 free credits that never expire. Website: https://www.qualisend.com Docs: https://www.qualisend.com

MCP readiness

F · 16/100

Readiness is how fully this listing follows its protocol and how it behaved in our probes over 30 days. It is shown for reference and does not move it in search. Search order and leaderboards use the separate quality grade (here E, 13.0/100), which weighs availability, conformance, p95 speed and descriptor. How the two differ

Valid MCP handshake	0/10	initialize did not answer cleanly (HTTP 405).
Live MCP endpoint	5/25	Endpoint answers, but not with MCP JSON-RPC (223 ms).
Protocol revision	0/10	No protocol revision reported by initialize.
Signed descriptor	n/a	No MCP standard defines a signed server descriptor.
Uptime (30 days)	0/15	0/22 probes succeeded over 30 days (0%).
Tool declaration	0/10	No tools listed by tools/list.
Verified identity	5/10	Publisher declared (repository, package or homepage); claim this listing to verify domain control.
Freshness + modern flags	4/5	seen in a source within 7 days.
Auth declaration	0/5	How to authenticate is not stated.

Applicable criteria total 90 points, scaled to 100.

Responsiveness: Responsive (223 ms; bands ≤2.5 s, ≤5 s, ≤8 s, slower; penalty only).

Measured 2026-11-11.

Nine criteria, the same as the A2A readiness score, read from our daily MCP probe (initialize + tools/list) and 30-day probe history. No MCP standard defines a signed server descriptor, so that criterion is n/a and the other 90 points are scaled to 100. Grades: A>=90, B>=75, C>=60, D>=40, F<40. Display only: search order uses the quality grade.

Compared with peers

Against 53,021 reachable MCP servers in our daily snapshot (2026-11-12 01:39 UTC). Display only; it does not change search order.

Readiness: Higher than 0% of peers; This listing 16 · peer median 81
Latency: Faster than 66% of peers; This listing 223 ms · peer median 326 ms

Where it loses the most points, and how to win them back

Live MCP endpoint −20 — Answer initialize and tools/list at the declared endpoint.
Now: Endpoint answers, but not with MCP JSON-RPC (223 ms).
Uptime (30 days) −15 — Stay reachable in our daily probes.
Now: 0/22 probes succeeded over 30 days (0%).
Valid MCP handshake −10 — Complete the MCP handshake without errors.
Now: initialize did not answer cleanly (HTTP 405).

How many agent tools actually work · All statistics

Listed in

Directories this entry was found in.

agenstry since 2026-10-22 ↗

How to connect

MCP endpoint (streamable-http)

https://www.qualisend.com/mcp

JSON-RPC initialize probe

curl -X POST https://www.qualisend.com/mcp \
  -H 'Content-Type: application/json' \
  -H 'Accept: application/json, text/event-stream' \
  -d '{"jsonrpc":"2.0","id":1,"method":"initialize","params":{}}'

Homepage

https://www.qualisend.com

Listed at (agenstry)

https://agenstry.com/mcp/hello-ovtj/qualisend