SendGuard is a sending-guardrails API that performs daily caps, warmup gating, bounce brakes, suppression and sender-auth checks before every send 1. Several other products cover adjacent parts of the outbound stack, such as pre-send email verification and deliverability monitoring, but they do not provide the same per-send guardrail call.
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SendGuardsendguard.aiwebsite read, tools not yet checked
A sending-guardrails API that applies daily caps, warmup gating, bounce brakes, suppression and sender-auth checks before each send, for n8n, SMTP, Gmail and AI-agent senders 1.
official:MCP server · SendGuard
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MailDignitymaildignity.comwebsite read, tools not yet checked
A filter that checks outbound emails for AI-generated slop, bot flattery and high-friction asks before sending, with API and MCP access 2.
official:MCP server · MailDignity
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PingValidpingvalid.comverified and signed
Validates whether an email address can receive mail before sending, returning a verdict and risk score through single and bulk validation actions 515.
official:MCP server · PingValid Email Validation
for agents: Validate a single email · Validate a list of emails · Query a bulk job
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Veriflyverifly.emailwebsite read, tools not yet checked
Email verification API for single and batch checks, disposable and role detection, and AI-agent workflows 3.
official:MCP server · Verifly+1 community tools built for it
Sources
- 1SendGuard - Sending Guardrails API for Self-Built Outboundsendguard.ai · read 2026-10-29
- 2MailDignity: The dignity filter for AI outbound and cold emailsmaildignity.com · read 2026-10-29
- 3Verifly - Email Verification APIverifly.email · read 2026-10-29
- 5Email validation for lists, signup forms and Claude · PingValidpingvalid.com · read 2026-10-29
- 9InboxGuard — Email deliverability monitoring & DMARC reportsinboxguard.io · read 2026-10-29
- 15EmailValidator: declares "Validate a single email" (the record we read and signed)unfragile.ai · read 2026-10-24
- 19InboxGuard: declares "Scan domain deliverability" (the record we read and signed)unfragile.ai · read 2026-10-24
For agents: the 10 actions behind this answer
· SendGuard website read, tools not yet checked
The sending discipline Instantly and Smartlead give you, as one API call for n8n, SMTP, Gmail, and AI-agent senders: daily caps, warmup gating, bounce brakes, suppression, and sender-auth checks before every send.
· MailDignity website read, tools not yet checked
Check outbound emails for AI slop, bot flattery and high-friction asks before you send. A safety layer for LLM-written outreach, with API & MCP for agents.
· Verifly website read, tools not yet checked
Fast email verification API for single checks, batch processing, disposable detection, role filtering, and AI-agent workflows.
· Qualisend website read, tools not yet checked
Verify email addresses in real time and clean whole lists before you send - syntax, DNS, disposable, role, catch-all and SMTP checks with a 0-100 score.
Validate a single email · EmailValidator verified and signed
Run the T0–T7 pipeline on one email and return verdict + per-tier evidence. e.g. Validate john@example.com e.g. Is alice@disposable.tld safe to send to?
· Kanta website read, tools not yet checked
Sequences fail when data fails. Kanta gives outbound teams the tools to find missing contacts, clean dirty lists, and pull verified B2B data — before bad emails burn your sender reputation.
getOutboundStatus · primitive.dev verified and signed
What can I send FROM? Lists this account's verified outbound (sendable) domains plus any domains still pending DNS verification, with next actions. Call this BEFORE sendEmail to pick a valid `from` domain — the account email is not necessarily sendable. The same sendable list is echoed in a cannot_s
· Aiguard website read, tools not yet checked
Secure AI agent email with LLM Guard prompt-injection detection, spam filtering, ClamAV scanning, and MCP server integration. Get your own free @aiguard.email address.
Scan domain deliverability · InboxGuard verified and signed
Run a full SPF/DKIM/DMARC/MTA-STS/TLS-RPT/BIMI/blocklist scan for a domain and return a 0–100 score with per-check findings. e.g. Is example.com set up correctly for DMARC? e.g. Why is mail from acme.io going to spam? e.g. Check if my domain is on any DNS blocklists.
· ParseBounce website read, tools not yet checked
Send campaigns and transactional email through your own AWS SES, SendGrid, or Mailgun — and see exactly what lands. Bounce, complaint, and deliverability tracking baked in.
Labels are the instruments' verdict and are never changed by ranking. Agents and robots get this same answer as JSON at /api/v1/find?q=…&answer=1 and through the MCP server.