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mcp/harbor
Verified official

WarmInboxes Free Deliverability Tools MCP

v1.0.0

com.warminboxes/deliverability-tools

Free cold email deliverability checks, list tools, inbox planning and original placement research.

transport:streamable-http tools:50
Website

Target client

run in your project directory 

claude mcp add --transport http deliverability-tools https://warminboxes.com/mcp

setup guides: Claude Code Claude Desktop Cursor VS Code Zed Windsurf Cline Gemini CLI Grok ChatGPT Claude.ai LangChain

Adds it for this project only. Append --scope user to make it available everywhere. Claude Code docs

check_deliverability Read-only

check deliverability

check_spf Read-only

check spf

check_dkim Read-only

check dkim

check_dmarc Read-only

check dmarc

check_bimi Read-only

check bimi

check_mta_sts Read-only

check mta sts

check_ssl Read-only

check ssl

check_dns Read-only

check dns

lookup_txt Read-only

lookup txt

check_rdns Read-only

check rdns

check_blacklist Read-only

check blacklist

check_surbl Read-only

check surbl

check_nameservers Read-only

check nameservers

check_domain_expiry Read-only

check domain expiry

check_google_domain Read-only

check google domain

check_cname Read-only

check cname

verify_email

verify email

lookup_mx Read-only

lookup mx

segment_esp

segment esp

plan_from_list

plan from list

plan_infrastructure

plan infrastructure

expand_spintax

expand spintax

generate_unsubscribe

generate unsubscribe

check_email_authentication Read-only

check email authentication

check_domain_reputation Read-only

check domain reputation

check_tracking_domain Read-only

check tracking domain

check_bulk_sender_requirements Read-only

check bulk sender requirements

analyze_headers

analyze headers

analyze_email_html

analyze email html

analyze_dmarc_report

analyze dmarc report

analyze_cold_email

analyze cold email

audit_campaign

audit campaign

analyze_bounces

analyze bounces

analyze_microsoft_headers

analyze microsoft headers

preview_inbox

preview inbox

generate_dns_records

generate dns records

plan_rotation

plan rotation

plan_verification_waterfall

plan verification waterfall

clean_csv

clean csv

convert_csv

convert csv

combine_csvs

combine csvs

check_suppression Read-only

check suppression

check_spamhaus_dbl Read-only

check spamhaus dbl

check_burned_inbox Read-only

check burned inbox

write_cold_email Mutating

write cold email

find_lead_lists Read-only

find lead lists

find_tools Read-only

find tools

find_resources Read-only

find resources

read_resource Read-only

read resource

get_pricing Read-only

get pricing

All 50 tools, one page each

Mutating and Read-only are read off each tool's name, not its schema — a hint, not a guarantee. Check the server's own documentation before granting access.