What is the WP Mail SMTP MCP server?
The WP Mail SMTP MCP server from AcrossAI lets Claude, ChatGPT, Cursor and any other MCP client diagnose email delivery, send a real test and fix the sending address on your WordPress site. It runs inside WordPress through the free Abilities Manager and MCP Manager plugins, and works through WP Mail SMTP itself — with no third-party relay in between.
Looking for another plugin? Browse all WordPress MCP integrations or the Email Delivery integrations.
What your AI can do with WP Mail SMTP
When WordPress email stops arriving, the settings rarely tell you why. These abilities let an AI assistant diagnose delivery, send a real test through WP Mail SMTP, and fix the sending address — without ever reading your SMTP password or API keys.
Diagnose delivery in one call
Check the mailer, missing credentials, conflicting mail plugins and the last recorded failure, with a plain verdict.
Prove it with a real test
Send a real message and get WP Mail SMTP’s own error text back when it fails. Always needs confirm.
Read settings without secrets
See the mailer and from address. Passwords and API keys come back only as set or not set.
Fix the sending address
Change the from address and name, and force them over what form plugins ask for.
Troubleshooting
WordPress not sending email? Three reasons it happens quietly.
Each of these leaves WP Mail SMTP looking configured while messages never reach the inbox.
Another plugin takes over email
A second mail plugin can replace WP Mail SMTP’s mailer without any warning. get-delivery-status names it.
A credential isn’t stored
Switching mailers without entering its API key leaves nothing able to send. The diagnosis lists what is missing.
The from address is rejected
Form plugins send from their own address unless it is forced. update-delivery-settings can force a working one.
Try asking
Paste one into Claude, ChatGPT or Cursor once your site is connected.
“Why aren’t our contact form emails arriving?”
“Is this site able to send email right now?”
“Send a test email to me@example.com and tell me what happened.”
“Which address does this site send email from?”
“Force every plugin to send from hello@example.com.”
“Is another plugin interfering with WP Mail SMTP?”
AcrossAI vs WPVibe vs Novamira for WP Mail SMTP
Three ways to connect an AI assistant to WP Mail SMTP. The difference is where the MCP server runs and what sits between your AI and your site.
| AcrossAI | WPVibe | Novamira | |
|---|---|---|---|
| Where the MCP server runs | On your WordPress site | Hosted gateway at mcp.wpvibe.ai | On your WordPress site |
| Third-party relay | None | Every call passes through WPVibe’s cloud | None |
| How it works with WP Mail SMTP | Dedicated WP Mail SMTP abilities, each labelled read-only, write or destructive | Plugin abilities, REST API and WP-CLI | General PHP access; no dedicated WP Mail SMTP specialization listed |
| Designed for | Production sites, with risky changes gated behind confirm | Any host reachable over HTTPS | Dev and staging environments with backups |
| Price | Free, including every WP Mail SMTP ability | Free plan with a daily action allowance; paid tiers | Free core; specializations in Novamira Pro |
Based on each product’s own published documentation, September 2026.
WP Mail SMTP + AI questions
Is there an MCP server for WP Mail SMTP?
Yes. AcrossAI turns your WordPress site into an MCP server with dedicated WP Mail SMTP abilities, so Claude, ChatGPT, Cursor or a local model can work with WP Mail SMTP directly. It’s free on WordPress.org.
Can ChatGPT or Claude manage WP Mail SMTP?
Yes, once your site is connected over MCP. Ask in plain English and your AI calls the WP Mail SMTP abilities on this page, with risky changes gated behind an explicit confirm.
Is the WP Mail SMTP integration free?
Yes. All of its abilities ship in Abilities Manager, which is free on WordPress.org.
Can the AI see my SMTP password or API key?
No. Credentials are reported only as set or not set, and nothing is decrypted to check them. No ability here can write a credential either.
Can the AI send email by accident?
No. Sending a test email always requires an explicit confirm and a recipient you name — it is never defaulted.
Which AI assistants work with it?
Any MCP client: Claude, ChatGPT, Gemini, Grok, Cursor, Claude Code, and local runtimes such as Ollama, LM Studio and Open WebUI.
Does my site data pass through AcrossAI’s servers?
No. Your WordPress site runs the MCP server and your AI client connects to it directly. There is no hosted gateway in the middle.
Is AcrossAI affiliated with WP Mail SMTP?
No. AcrossAI built and maintains this integration independently, using WP Mail SMTP’s public APIs.