com.themailx/email-deliverability
MailX Email Deliverability
Check SPF/DKIM/DMARC/BIMI, blacklists, SMTP/IMAP; DNS lookups; generate email DNS records.
alive probed 2026-10-14 · HTTP 200
17tools
4.1ktokens in Claude Opus 5.5
4.3ktokens in Claude Code
2.0 %of a 200k context window
2.3ko200k_base estimate
536 msto initialize
203 msto list tools
- Endpoint
- https://themailx.com/mcp (streamable-http)
- Host
- themailx.com
- Protocol
- 2025-11-25
- Reports itself as
- mailx-deliverability 1.0.0
- Capabilities
- prompts, resources, tools
- Instructions
- 727 characters
- Claude count
- Claude Opus 5.5, measured 2026-10-14. Counted again when the tool definitions change. Method.
- Website
- https://themailx.com
- Registry
- active, updated 2026-04-17 · registry entry
- Reachable
- 8 of the last 8 probes
Most expensive tools
| Tool | Tokens (o200k) | Share of this server |
|---|---|---|
| spf_generate | 348 | 15 % |
| smtp_check | 256 | 11 % |
| imap_check | 207 | 9 % |
| dkim_check | 175 | 7 % |
| audit_domain | 173 | 7 % |
History
We add a row when the result changes. A server with no change keeps its last row.
| Probed | Result | Init | Tools | Claude | o200k |
|---|---|---|---|---|---|
| 2026-10-14 09:15 | alive | 701 ms | 17 | 4.1k | 2.3k |
| 2026-10-12 11:33 | alive | 2.1 s | 16 | 3.8k | 2.2k |
| 2026-10-05 13:46 | alive | 536 ms | 16 | 3.2k | 1.8k |
| 2026-10-05 00:21 | alive | 571 ms | 16 | 1.8k | |
| 2026-10-04 09:59 | alive | 2.1 s | 16 | 1.8k | |
| 2026-10-04 07:52 | alive | 2.5 s | 16 | 1.8k | |
| 2026-10-03 20:32 | alive | 1.3 s | 16 | 1.8k | |
| 2026-10-03 17:50 | alive | 756 ms | 16 | 1.8k |
Badge and feed
[](https://mcpcost.ulehla.dev/s/com.themailx/email-deliverability)
An entry for every probe that changed the result, the tool count or the token cost: Atom feed. Add it to a feed reader or a Slack RSS app to hear when the server stops answering or its tool set grows.