Multi-provider failover
Attach SES, SendGrid, Postmark, Mailgun and eleven more. If one provider rate-limits or errors, the send falls to the next attached provider in the same rule — same message, no retry from your app.
Read moreIndustries — B2B SaaS
Transactional email your product team can trust.
Transactional and product notifications across every provider you already pay for — with automatic failover.
Transactional at scale
B2B SaaS
Four sendrules capabilities mapped to the pain that defines this segment. Every one of them is on the free plan.
- Multi-provider failover
- One rule per traffic class
- Real deliverability dashboards
- Webhook-driven state
The pain
What you deal with today.
Your onboarding emails, receipts, password resets, and product notifications go through one ESP. When that ESP has an outage — and every ESP has outages — your product silently stops emailing. Users churn, support tickets spike, and nobody notices until Monday.
How sendrules answers
What changes when you route through us.
sendrules puts your app in front of every provider you already trust. One SMTP endpoint, four to ten providers attached, automatic failover on 4xx and 5xx responses. Your product code changes zero lines; the resilience shows up in the routing layer.
The four capabilities
Feature per pain, not the other way round.
One rule per traffic class
Split transactional (receipts, resets) from lifecycle (welcome, dunning) and each gets its own rule, its own providers, its own limits — so a marketing campaign can never knock out a password reset.
Read moreReal deliverability dashboards
DMARC compliance %, Postmaster reputation, blocklist status, and seed-list inbox rate — one view per sending domain, updated automatically.
Read moreWebhook-driven state
HMAC-signed events for delivered/bounced/complained/opened, retried on schedule, replayable from the UI. Wire them into your billing, CRM, or in-app inbox.
Read moreWhere it lands
Concrete scenarios you can wire in this week.
- Password resets and OTP codes with provider failover so a single ESP outage never blocks logins
- Invoice + receipt delivery with a signed webhook to your billing system when the message actually reaches the inbox
- Product notifications (mentions, digests, alerts) routed by recipient ISP for best inbox placement
- Dunning and card-decline mail routed on a stricter rule so it can't share a queue with marketing
- Trial-to-paid nurture with the quality gate rejecting typo'd signup addresses before they eat your ESP quota
Also relevant
Other segments with similar shapes.
E-commerce & Retail
Route Gmail buyers, Yahoo buyers, and Outlook buyers each through their best-fitting provider — from the same store.
Marketing Agencies & MSPs
Manage sending for thirty clients on their own provider accounts — one endpoint, per-client rules, no shared credentials.
Sales Development & Outbound
Verify every recipient in-line. Then parse every autoresponder reply for the person actually handling the account.
Recruitment & Staffing
Autoresponders from busy hiring managers routinely name the actual decision-maker. Capture them automatically.
Real Estate & Lead Gen
Property inquiry mail flowing both ways — outbound quality-gated, inbound classified and parsed for the buyer's real coordinates.
Financial Services
Statements, alerts, and regulator-facing correspondence with DMARC monitoring, signed webhooks, and a full audit log.
B2B SaaS teams start on the free plan.
Five thousand messages a month. Every feature above included. Attach your existing provider and see whether the numbers move.