sendrules
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Product
  • Overview
    How sendrules fits between your app and every provider.
  • SMTP Proxy
    One endpoint. Every provider you already trust.
  • Grid & Rules
    Six routing strategies. Coverage warnings. Failover.
  • Quality Gate
    Verify recipients before the send, not after the bounce.
  • ISP Routing
    Route by the recipient's live MX record — not domain strings.
  • Ramp-up
    Auto-advancing cap with bounce/complaint safety gates.
  • Limits & Queue
    Four-tier caps. Queue, don't drop. Midnight-UTC release.
  • Webhooks
    Signed and verifiable. Retried on schedule. Replayable.
  • Activity
    Seven filtered inboxes. Sparklines. Share links.
  • Inbound
    Receive + classify replies, bounces, and OOOs.
  • Autoresponder Parser
    Harvest contacts from OOO replies into lists — webhook or CSV.
  • REST API
    Every UI action has an endpoint. Scoped, rotatable keys.
  • Teams and roles
    Fine-grained RBAC across 30 resource types + audit trail.
Deliverability
  • Overview
    The suite most vendors sell separately.
  • DMARC Monitoring
    DMARC aggregate reports ingested with per-source breakdowns.
  • Auth Check
    SPF / DKIM / DMARC, graded A through F.
  • Postmaster Tools
    Google Postmaster data in per-domain views.
  • Blocklists
    Continuous blocklist + seed-list inbox placement.
  • Free Tools
    Email validation, spam check, DMARC generator — free on every plan.
How it Works
Industries
  • All industries
    Every segment sendrules fits — and why.
  • B2B SaaS
    Transactional at scale. Failover across ESPs.
  • E-commerce & Retail
    One rule per ISP — Gmail buyers routed differently to Yahoo.
  • Marketing Agencies
    Per-client rules on your clients' own provider accounts.
  • Sales Development
    Verify every address. Parse every autoresponder for referrals.
  • Recruitment & Staffing
    OOO replies are full of decision-maker names — capture them.
  • Real Estate & Lead Gen
    Inquiry email hygiene + reply-source enrichment.
  • Financial Services
    DMARC compliance, audit log, signed webhooks.
  • Healthcare & Life Sciences
    Reliable patient comms with a full audit trail.
  • EdTech & Education
    Enrollment-week bursts absorbed by queue-don't-drop.
  • Nonprofit & Fundraising
    Donor-appeal deliverability without a deliverability team.
  • Publishers & Media
    Newsletter deliverability + list hygiene at every send.
  • Government & Public Sector
    IP allow-list at AUTH, DMARC-first, tenant isolation.
PricingProduct Demo
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SMTP relay

Custom SMTP + sendrules — one endpoint, your account.

Any SMTP server you already run — a Postfix, a legacy relay, a vendor we haven't listed by name.

Attach Custom SMTPSee all integrations
What you keep

Your Custom SMTP account, unchanged.

You keep any SMTP server you already run — a Postfix host, a legacy sendmail, a vendor relay we haven't listed by name. sendrules attaches it as one more provider in the fleet, with routing, an inline quality gate, and one activity log on top.

What sendrules adds

Routing, verification, and observability on top.

  • Grid & Rules routing — attach Custom SMTP to a Grid alongside other providers and route by strategy or MX.
  • Inline Quality Gate — six per-recipient checks before Custom SMTP ever sees the address.
  • 4-tier limits + queue-don’t-drop — cap by rule, provider, pair, or mailbox.
  • Ramp-up + safety holds — auto-warmup with bounce and complaint gates.
  • Observability — per-message route log with the exact reason for every decision.
How to attach

Attach Custom SMTP in under two minutes.

The Add Provider wizard prompts for your Custom SMTP credentials with the standard host and port already filled in for you, so you can save the provider without hunting for defaults. A pre-flight Test Connection button confirms the credentials work before you commit.

Also supported

Every other provider you already use.

sendrules is BYO-provider — attach as many as you want in one tenant.

Google Workspace

Your Google Workspace mailbox reputation and DKIM.

See details

Mailcrux

Your Mailcrux credentials and per-domain setup.

See details

AWS SES

Your SES pricing, dedicated IPs, and configuration sets.

See details

SendGrid

Your SendGrid API key, IP pools, and Dynamic Templates.

See details

Mailgun

Your Mailgun domain, sending IPs, and routes.

See details

Postmark

Your Postmark server token and message streams.

See details

Attach Custom SMTP to your first Grid.

Start freeSee all integrations
sendrules

One SMTP endpoint across 15 providers. Verify recipients before the send, route by real MX, and monitor DMARC in the same product.

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Product

  • SMTP Proxy
  • Grid & Rules
  • Quality Gate
  • ISP Routing
  • Ramp-up
  • Limits & Queue
  • Webhooks
  • Activity
  • Inbound
  • Autoresponder Parser
  • REST API
  • Teams and roles
  • Integrations

Deliverability

  • DMARC Monitoring
  • Auth Check
  • Postmaster Tools
  • Blocklists
  • Free Tools
  • Providers

Solutions

  • How it Works
  • Industries
  • Customers
  • Pricing
  • Contact

Company

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  • DPA
  • Acceptable Use

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