Mail7 Email Validation vs Oldweb Diagnostics
A side-by-side look at the Mail7 Email Validation and Oldweb Diagnostics MCP servers: transport, auth, tools, quality signals, and the config to install either one in Claude, Cursor, Windsurf or VS Code.
O
Oldweb DiagnosticsCommunicationPublic DNS, HTTPS and deployment checks, plus offline email header and delivery-log tracing.36FairAuth: no auth requiredVerdict: choose Mail7 Email Validation for communication work as a local process; choose Oldweb Diagnostics for communication. You can also run both side by side in one mcpServers block.
Which MCP server should you choose?
Choose Mail7 Email Validation when
- You need dedicated capabilities in the Communication domain.
- You prefer a local stdio subprocess transport.
- You have the keys it needs:
MAIL7_API_KEY, MAIL7_BASE_URL. - You want tools like
validate_email, validate_emails, check_domain.
OChoose Oldweb Diagnostics when
- You need dedicated capabilities in the Communication domain.
- Its auth model fits you: No auth required.
Feature & specification comparison
Rows where the two servers differ are marked.
| Spec | O Oldweb Diagnostics | |
|---|---|---|
| Category | Communication | Communication |
| Quality signal | 56/100 · Good | 36/100 · Fair |
| Install command | Confirmed | Not confirmed yet |
| Transport | Local subprocess (stdio) | — |
| Auth | Not declared | No auth required |
| Pricing | Not declared | Free |
| Required env vars | MAIL7_API_KEYMAIL7_BASE_URL | None listed |
| Verified owner | Community listing | Community listing |
| GitHub stars | 0 | 0 |
| Directory activity | 2 views 0 installs 0 upvotes | 0 views 0 installs 0 upvotes |
| Tools | 4 | Not listed |
| Full listing | View Mail7 Email Validation | View Oldweb Diagnostics |
Tools & capabilities
Mail7 Email Validation tools 4
validate_emailCheck whether a single email address is deliverable: syntax, domain MX records, disposable-domain database and a live SMTP mailbox probe. Status is one of "Valid", "Not Valid", "Unknown". Unknown means the mailbox could NOT be checked (catch-all domain, greylisting, blocked SMTP port) - it is NOT a bad address. Never delete, reject or report Unknown addresses as invalid; present them separately and let the user decide. Use validate_emails instead when you have more than one address.validate_emailsCheck up to 50 email addresses in one call and get a per-address verdict plus a summary. Status is one of "Valid", "Not Valid", "Unknown". Unknown means the mailbox could NOT be checked (catch-all domain, greylisting, blocked SMTP port) - it is NOT a bad address. Never delete, reject or report Unknown addresses as invalid; present them separately and let the user decide. Requires MAIL7_API_KEY (anonymous callers get a 25-address free sample only). Each address takes a few seconds of real SMTP work, so this call is slow by nature: for a longer list, split it and call this tool repeatedly with the next 50 addresses. Never run two calls in parallel - the API serialises one bulk job per client and the second call fails.check_domainAudit a domain's email setup in one call: MX records, SPF, DKIM, DMARC, MTA-STS, TLS-RPT, DNSSEC and BIMI, graded A-F with a fix for every problem found. Use this to answer "can this domain send and receive mail" or "why do our messages land in spam". Takes a domain (example.com), not an email address. The default answer summarises every section; pass `section` to get the full records and findings of one of them.check_spfFetch and analyse the SPF record of a domain: the raw record, its mechanisms, lookup count and common misconfigurations. Use check_domain instead when the question is about overall deliverability rather than SPF specifically.
Oldweb Diagnostics tools
No tool names declared yet. Check the project README from the listing page.
Ready-to-paste client configs
Paste either block (or both) into your client config, e.g. claude_desktop_config.json or ~/.cursor/mcp.json. We only show a config when the install command is confirmed.
Mail7 Email Validation
{
"mcpServers": {
"mail7-email-validation": {
"command": "npx",
"args": [
"-y",
"mail7-mcp"
],
"env": {
"MAIL7_API_KEY": "YOUR_MAIL7_API_KEY_HERE",
"MAIL7_BASE_URL": "YOUR_MAIL7_BASE_URL_HERE"
}
}
}
}
Oldweb Diagnostics
No confirmed install command for Oldweb Diagnostics yet — follow the setup steps linked from its listing page rather than a guessed package name.
Frequently asked questions
Mail7 Email Validation is categorized under Communication and uses a local stdio subprocess. Oldweb Diagnostics belongs to Communication and uses an install path we have not confirmed yet. Pick Mail7 Email Validation for communication work and Oldweb Diagnostics for communication.
Copy the mcpServers block from the config section on this page into your client's config (for example claude_desktop_config.json or ~/.cursor/mcp.json), then fully restart the client. Oldweb Diagnostics has no confirmed install command yet — follow its own setup instructions.
Mail7 Email Validation has no declared pricing — check the project's own site. Oldweb Diagnostics is listed as free. Auth: no auth required. If a server needs environment variables such as API keys, define them under the env key in your client's MCP config.
Yes. MCP clients support multiple servers: add mail7-email-validation and oldweb-diagnostics as separate keys in the same mcpServers object, and your assistant will call tools from either one.
On AllMCPs, Mail7 Email Validation has a quality signal of 56/100 (Good) with 2 views, 0 installs and 0 GitHub stars. Oldweb Diagnostics has 36/100 (Fair) with 0 views, 0 installs and 0 GitHub stars.