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MCP server that sends mail over SMTP, gated behind an allowlist and a human confirmation
npx @getmcp/cli add io.github.ni-c/smtp-mcpRequires Node.js 18+. Community-contributed server. Review source before installing.
SMTP_HOSTHostname of the SMTP server, e.g. smtp.example.net.
SMTP_USERUsername for SMTP authentication.
SMTP_PASSWORDPassword or app-specific password for SMTP authentication.
SMTP_FROMThe only sender this server will use, e.g. "Name <person@example.net>". There is no from parameter.
Config file: ~/Library/Application Support/Claude/claude_desktop_config.json
{
"mcpServers": {
"io.github.ni-c/smtp-mcp": {
"command": "npx",
"args": [
"-y",
"@ni-c/smtp-mcp"
],
"env": {
"SMTP_HOST": "",
"SMTP_PORT": "",
"SMTP_TLS": "",
"SMTP_USER": "",
"SMTP_PASSWORD": "",
"SMTP_FROM": "",
"SMTP_ALLOW_SEND": "",
"SMTP_ALLOWED_RECIPIENTS": "",
"SMTP_MAX_RECIPIENTS": "",
"SMTP_MAX_SENDS_PER_HOUR": "",
"SMTP_MAX_MESSAGE_BYTES": "",
"SMTP_MAX_ATTACHMENT_BYTES": "",
"SMTP_ATTACHMENT_DIR": "",
"SMTP_ATTACHMENT_TYPES": "",
"SMTP_SIGNATURE": "",
"SMTP_AUDIT_LOG": "",
"SMTP_ALLOW_TOOLS": "",
"SMTP_DENY_TOOLS": "",
"SMTP_INSECURE_TLS": ""
}
}
}
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