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strato-mail-mcp

strato-mail-mcp

by Ragazzoforte

Strato Mail MCP Server v2

Volledige mail client voor Claude via IMAP + SMTP — perfect voor Portainer hosting.


šŸŽÆ Features

āœ… IMAP Functionaliteit:

  • Alle mails lezen (onderwerp, body, HTML, headers)

  • Zoeken met geavanceerde IMAP filters

  • Folder management (switch, list)

  • Email flags (read/unread, starred, draft)

  • Attachment handling

  • Bulk operations

āœ… SMTP Functionaliteit:

  • Mails verzenden

  • CC/BCC support

  • HTML + plain text

āœ… Extra:

  • Mailbox statistics

  • Draft management

  • Portainer-ready Docker setup

  • Attachment persistence

  • Health checks


Related MCP server: email-mcp

šŸš€ Quick Start (Docker in Portainer)

1. In Portainer: Stacks → Add Stack

Name: strato-mail-mcp

Paste this:

version: '3.8'

services:
  strato-mail-mcp:
    build:
      context: https://github.com/yourusername/strato-mail-mcp.git
      dockerfile: Dockerfile
    container_name: strato-mail-mcp
    image: strato-mail-mcp:latest
    restart: unless-stopped
    environment:
      IMAP_HOST: imap.strato.com
      IMAP_PORT: 993
      IMAP_USER: ${IMAP_USER}
      IMAP_PASSWORD: ${IMAP_PASSWORD}
      SMTP_HOST: smtp.strato.com
      SMTP_PORT: 465
      ATTACHMENT_DIR: /app/attachments
      NODE_ENV: production
    volumes:
      - strato-attachments:/app/attachments
    deploy:
      resources:
        limits:
          cpus: '0.5'
          memory: 256M
    logging:
      driver: "json-file"
      options:
        max-size: "10m"
        max-file: "3"

volumes:
  strato-attachments:
    driver: local

2. Set Environment Variables

In Portainer Stack UI, add before deploying:

IMAP_USER=jouw-email@example.com
IMAP_PASSWORD=jouw-strato-password

3. Deploy

Click "Deploy the stack" → Wait ~30 seconds

4. Verify

In Portainer → Containers → strato-mail-mcp

  • Should show Running

  • Logs should show: [strato-mail-mcp] āœ“ Server started - Ready for Claude


šŸ”— Integratie met Claude

Option A: Lokaal (Windows/Mac/Linux)

Ga naar Claude Settings → Developer → MCP Settings:

{
  "mcpServers": {
    "strato-mail": {
      "command": "node",
      "args": ["/path/to/strato-mail-mcp/server.js"],
      "env": {
        "IMAP_USER": "jouw-email@example.com",
        "IMAP_PASSWORD": "jouw-password"
      }
    }
  }
}

Herstart Claude → strato-mail is nu beschikbaar

Option B: Remote Docker (SSH naar Portainer host)

{
  "mcpServers": {
    "strato-mail": {
      "command": "docker",
      "args": ["exec", "-i", "strato-mail-mcp", "node", "/app/server.js"],
      "env": {
        "IMAP_USER": "jouw-email@example.com",
        "IMAP_PASSWORD": "jouw-password"
      }
    }
  }
}

šŸ“§ Beschikbare Tools

get_folders()
→ List alle mail folders (INBOX, Sent, Drafts, etc.)

search_emails(query, limit, folder)
→ Search met IMAP syntax:
   - ALL
   - UNSEEN
   - SEEN
   - FROM "user@example.com"
   - SUBJECT "keyword"
   - SINCE 15-Mar-2024
   - FLAGGED
   - DRAFT
   Voorbeelden: "UNSEEN FROM triple-audio", "ALL", "FLAGGED"

read_email(uid)
→ Lees volledige email (with attachments)

get_recent(count, folder)
→ Haal X recente mails (default 20)

get_mailbox_status()
→ Get folder statistieken (total, unread, recent)

Send & Draft

send_email(to, subject, text/html, cc, bcc)
→ Verstuur email direct

save_draft(to, subject, text/html)
→ Opslaan als concept

Manage

mark_read(uids)
→ Mark emails as read

mark_unread(uids)
→ Mark emails as unread

mark_flagged(uids)
→ Star/flag emails

unmark_flagged(uids)
→ Remove star

switch_folder(folder)
→ Switch to different folder

move_email(uids, folder)
→ Move emails to folder

delete_email(uids)
→ Delete emails

Files

get_attachment(uid, filename)
→ Get attachment path (for Claude to access)

šŸ”§ Configuration Details

Strato Settings

IMAP:

  • Host: imap.strato.com (SSL/TLS)

  • Port: 993

  • User: je Strato email

  • Pass: je Strato password

SMTP:

  • Host: smtp.strato.com (SSL/TLS)

  • Port: 465

  • User: je Strato email

  • Pass: je Strato password

Docker Volumes

  • strato-attachments → Attachments opgeslagen in /app/attachments

  • Persisten over container restarts

Resource Limits

  • CPU: max 0.5 cores

  • Memory: max 256MB

  • Reserved: 0.25 CPU, 128MB RAM


šŸ› Troubleshooting

"IMAP connection failed"

Check in Portainer logs:
Containers → strato-mail-mcp → Logs

Waarschijnlijke oorzaken:
- IMAP_USER/PASSWORD incorrect
- Strato account IMAP disabled
- Network firewall port 993 blocked

"SMTP auth failed"

Check:
- IMAP_PASSWORD is correct (same for SMTP at Strato)
- Strato account allows SMTP
- Port 465 not blocked

Attachments not saving

Check volume is mounted:
docker inspect strato-mail-mcp | grep -A 5 Mounts

Should show: /app/attachments → strato-attachments

Slow searches

IMAP is inherent slow for large mailboxes.
Use more specific queries:
- "UNSEEN" instead of "ALL"
- "FROM example.com" to narrow down
- Limit parameter

šŸ“ˆ Monitoring

In Portainer

  1. Containers → strato-mail-mcp

  2. Stats tab → CPU/Memory usage

  3. Logs → Real-time activity

Docker CLI

# Follow logs
docker logs -f strato-mail-mcp

# Container stats
docker stats strato-mail-mcp

# Shell access (debug)
docker exec -it strato-mail-mcp sh

šŸ” Security

āš ļø Credentials Storage:

  • .env contains password (NEVER commit to git!)

  • In Portainer: credentials stored in container variables (encrypted)

  • In Docker: use .env file OR Portainer UI (don't hardcode)

  • Recommended: Use Portainer "Secrets" for production

Access Control:

  • Container runs as non-root user

  • TLS/SSL for IMAP (993) and SMTP (465)

  • Local filesystem attachments only


šŸš€ Advanced

Custom Folders

Strato default folders: INBOX, Sent, Drafts, Trash, Junk

If you have custom folders, use full path:

switch_folder("folder/subfolder")

Email Size Limits

Strato typically allows:

  • Single mail: up to 50MB (with attachments)

  • Mailbox: depends on plan

Large attachments are downloaded to container volume automatically.

Rate Limiting

IMAP servers have implicit rate limits. If you get "too many connections":

  • Reduce concurrent searches

  • Add delays between operations

  • Use specific queries instead of broad searches


šŸ“ API Examples (in Claude)

Search unread emails

"Search my unread emails from Triple Audio"
→ Claude calls: search_emails(query="UNSEEN FROM triple-audio")

Read recent mails

"Show me my last 5 emails"
→ Claude calls: get_recent(count=5)

Send email

"Send email to marco@triple-audio.nl with subject 'Themis Update'"
→ Claude calls: send_email(to="marco@...", subject="Themis Update", text="...", html="...")

Manage folders

"Move all Themis emails to a folder"
→ Claude calls: search_emails(query='SUBJECT "Themis"') → move_email(uids=[...], folder="Themis")

šŸ›‘ Stopping / Updating

In Portainer

  1. Stacks → strato-mail-mcp

  2. Stop: click Stop

  3. Update: remove stack, re-deploy with new code

  4. Logs: check health status

Docker CLI

# Stop
docker-compose down

# Restart
docker-compose up -d

# View logs
docker logs strato-mail-mcp

šŸ“ž Support

If issues:

  1. Check logs: docker logs strato-mail-mcp

  2. Verify Strato credentials work in email client

  3. Check IMAP/SMTP ports (993, 465) are accessible

  4. Ensure .env is correctly set


Version: 2.0.0
Status: āœ… Production-ready for Portainer

Available Tools

15 tools
delete_emailC

Delete email(s)

Inputs: uids (required).

get_attachmentB

Get attachment file path

Inputs: uid (required), filename (required).

get_foldersA

List all mail folders (INBOX, Sent, Drafts, etc.)

Inputs: no named parameters.

get_mailbox_statusB

Get current folder statistics

Inputs: no named parameters.

get_recentB

Get recent emails from specified folder

Inputs: count, folder.

mark_flaggedC

Star/flag email(s)

Inputs: uids (required).

mark_readB

Mark email(s) as read

Inputs: uids (required).

mark_unreadB

Mark email(s) as unread

Inputs: uids (required).

move_emailC

Move email(s) to folder

Inputs: uids (required), folder (required).

read_emailA

Read full email content by UID

Inputs: uid (required).

save_draftB

Save email as draft (IMAP DRAFT folder)

Inputs: to (required), subject (required), html, text.

search_emailsB

Search emails. IMAP syntax: ALL, UNSEEN, SEEN, FLAGGED, DRAFT, FROM "user@example.com", SUBJECT "word", BODY "word", SINCE 15-Mar-2024, BEFORE 20-Mar-2024

Inputs: query (required), limit, folder.

send_emailB

Send email via SMTP

Inputs: to (required), subject (required), cc, bcc, +2 more.

switch_folderC

Switch to different folder

Inputs: folder (required).

unmark_flaggedB

Remove star/flag from email(s)

Inputs: uids (required).

Tool Schema Changelog

Recent tool additions, removals, and schema changes observed during successful MCP inspections.

Loading tool schema changelog…

    TDQS

    B3.3/5.0

    Scored across 15 tools

    Disambiguation5/5

    Each tool targets a distinct email operation: folder listing, email search, reading, sending, drafting, flag management, moving, deleting, and attachments. Even closely related tools like get_folders, switch_folder, and get_mailbox_status have clearly separate purposes.

    Naming Consistency5/5

    All tool names follow a consistent verb_noun pattern using snake_case, such as get_folders, send_email, mark_read, and delete_email. There are no mixed styles or vague verbs.

    Tool Count5/5

    15 tools is well-scoped for an email MCP server, covering the full range of common operations without redundancy. Each tool earns its place, and the count is at the upper end of the ideal range but appropriate.

    Completeness4/5

    The tool set covers core email workflows: send, receive, search, read, draft, flags, move, delete, attachments, and folder selection. Minor gaps include lack of folder creation/deletion and advanced search refinement, but these are not critical for typical usage.

    Maintenance

    ActivityInactive
    ResponsivenessNo recent community issues

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