SMTP

🔑 BYO Key — Email

Send transactional email through your own SMTP server (Gmail, Outlook, custom mailserver). Bring your own credentials — full control over deliverability and sender reputation.

🔑 Setup Required — Bring Your Own Key This integration requires API credentials. Store them once via setup_integration or the Dashboard Vault — they're encrypted with AES-256-GCM and never exposed.

Required Credentials

smtp_host

SMTP Host

e.g. smtp.gmail.com or mail.example.com

smtp_port

SMTP Port

587 (STARTTLS, recommended), 465 (SSL), 25 (plain), or 2525

smtp_username

SMTP Username

Usually your full email address

smtp_password

SMTP Password

For Gmail/Outlook: use an app-specific password, not your main password

smtp_encryption

Encryption

tls (STARTTLS, port 587), ssl (port 465), or none (port 25 — not recommended)

smtp_from_address

From Address

Default sender address — locked here to prevent open-relay abuse. Cannot be overridden per call.

smtp_from_name

From Name

Display name shown in recipient inboxes (e.g. "My Company")

Get your API key at www.websitepublisher.ai →

Try it with your AI assistant

Once WebsitePublisher is connected to your AI assistant, paste one of these into the chat. Replace the parts in [brackets] with your own details.

ChatGPT Claude Other assistants

@WebsitePublisher send my booking and login emails through my own mail server [mail.yourdomain.com]

@WebsitePublisher test the connection to my SMTP server

With WebsitePublisher, send my booking and login emails through my own mail server [mail.yourdomain.com]

With WebsitePublisher, test the connection to my SMTP server

With WebsitePublisher, send my booking and login emails through my own mail server [mail.yourdomain.com]

With WebsitePublisher, test the connection to my SMTP server

Endpoints (3)

POST send-email

Queue an email for asynchronous delivery via SMTP. Returns immediately; worker picks up the job from the smtp queue. Use this for normal transactional sends (form notifications, confirmations).

Field	Type	Required	Description
`to`	string\|array	✓ Yes	Recipient email address, or array of addresses (max 50)
`subject`	string	✓ Yes	Email subject line
`html`	string	No	HTML body content. Provide either html, text, or both.
`text`	string	No	Plain text body (fallback for clients that do not render HTML)
`reply_to`	string	No	Reply-to address (optional — defaults to from address)

POST send-emails

Send multiple emails in a single TCP connection (keep-alive). Synchronous — returns per-email status. Use for newsletters or batched notifications. Max 50 emails per call.

Field	Type	Required	Description
`emails`	array	✓ Yes	Array of email objects, each with: to (string\|array), subject (string), html (string), text (string), reply_to (string)

POST test-connection

Validate SMTP credentials by performing the full TCP + TLS + AUTH handshake against the configured server. No email is sent. Returns duration_ms on success, mapped error message on failure.

No input parameters required.

MCP Tool Names

When using this integration through an AI assistant (Claude, ChatGPT, Cursor, etc.), the endpoints are available as MCP tools:

Endpoint	MCP Tool Name
send-email	`smtp_send_email`
send-emails	`smtp_send_emails`
test-connection	`smtp_test_connection`

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