Deliverability insights
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"I Never Got the Confirmation" — The #1 Support Ticket You Can Eliminate
Every support team sees the same ticket daily. It is always the same root cause. Here is how to kill it at the source.
Registration Emails in Spam: You're Losing 20% of Signups
Email verification in spam = abandoned signups. Nobody complains, they just bounce. Here is how to measure the hidden conversion loss and fix it.
Your App Sends 50 Emails/Day. Do You Know Where They Go?
Every SaaS quietly leaks dozens of transactional emails a day — welcome, reset, 2FA, invoice, invite. Your ESP says "delivered". That is not the same as "in the inbox". Here is the fix.
Order Confirmation in Spam: The Silent Revenue Killer for E-commerce
One missed order confirmation = support ticket + duplicate order + chargeback risk + lost LTV. Here is the economics and the fix, platform-agnostic.
Your Users Aren't Receiving Password Reset Emails. You Just Don't Know It Yet
Missed password resets are the quietest churn in SaaS: users never write a ticket, they just leave. Here is why it is invisible, and the simple monitoring to expose it.
Why You Should Add Seed Emails to Every Campaign (and How to Do It)
Open rate lies, delivery rate lies, spam complaints lag. Seed emails are the only signal that tells you where your campaign actually landed — here is how to add them to every send.
Mailtrap for Staging, Inbox Check for Production: The Missing Half of Your Email QA
Mailtrap catches bugs before production. Inbox Check catches bugs in production. Here is why you need both — and how seed emails on every real send close the loop.
Selzy (ex Sendsay): Email Deliverability + Seed Testing
Selzy reports solid delivery rates but says nothing about Inbox vs Promotions vs Spam. Seed-address testing fills the gap in five minutes per campaign.
Mandrill (Mailchimp Transactional): Seed Test API-Sent Emails
Mandrill handles billions of transactional sends. Its dashboard reports delivery, not placement. Seed addresses close the blind spot.
Customer.io / Courier: Multi-Channel — Test the Email Leg With Seeds
Multi-channel tools ship push + SMS + email. The email leg is the one that silently lands in spam. Add seed addresses to catch it.
Loops: Product Email for SaaS — Seed Test Your Onboarding Sequences
Loops drives SaaS onboarding and feature emails. If day-1 welcome lands in Gmail Promotions, activation dies. Add seeds to every sequence.
Resend: Modern Email API — Seed Test Your React Email Templates
Resend pairs with React Email for developer-friendly templates. Adding seed recipients takes one array entry and gives you real per-provider placement.
SparkPost (MessageBird): Seed Testing at Scale
SparkPost powers enterprise volume. Dashboards show bounces; seed tests show folder placement. Here is how to bake seeds into every campaign.
Mailgun: API-First Email — Add Seeds Programmatically
Mailgun is API-first; adding seed addresses is three lines of code. Wrap it in your send helper and every outbound call produces a placement check.
Postmark: Transactional Email Seed Testing for Developers
Postmark is known for reliable transactional delivery. But "delivered" is not "inboxed". Add seed addresses on every template and verify.
Amazon SES: How to Add Seed Emails to Bulk Sends
SES is the cheapest ESP at scale. It also tells you the least about where mail lands. Seed addresses on every BulkEmail API call fix that.
SendGrid: Seed Test Your Transactional Emails (Not Just Marketing)
Most guides tell you to seed-test marketing sends. SendGrid transactional needs it more — password resets hitting Spam is a support-ticket nightmare.
Close CRM: Email Sequences + Seed Testing
Close CRM sequences drive sales email at scale. Add seed addresses to every sequence and alert on drops before prospects stop replying.
Snov.io: Drip Campaign Deliverability — Add Seeds Before You Send
Snov.io drip campaigns run unattended for weeks. A single reputation hit can silently kill placement. Seeds on every stage give you a canary.
Hunter.io Campaigns: Seed Test Your Hunter Outreach
Hunter Campaigns is popular for founder-led outreach. Low volume, high importance per send. Seeds verify your first message actually reaches the prospect.
GMass: Gmail-Based Outreach — Seed Test From Your Own Account
GMass sends from your own Gmail account. That means your reputation — not an ESP pool — is on the line. Seed every campaign before volume scales.
Mailshake: How to Test Deliverability Before Your Campaign Goes Live
Mailshake ships campaigns fast. Seed addresses in the test-list let you verify placement before the real recipients ever see the subject line.
Salesloft (Outreach): Enterprise Cold Email — Seed Test Your Cadences
Salesloft/Outreach own enterprise sales email. Cadences run for weeks. Seed a dedicated account into every cadence and you have a continuous placement monitor.
Reply.io: Add Inbox Placement Check to Your Sequences
Reply.io automates multi-channel outbound. Seed addresses in the sequence contact list give you verifiable inbox placement per stage.
Smartlead: Seed Testing With Inbox Rotation
Smartlead rotates senders automatically. A seed that lands in spam on rotation-hop three tells you which account warmed incorrectly.
Woodpecker: Seed Emails for Cold Campaigns — Step by Step
Woodpecker is popular with small teams. Add 5 seeds to every campaign and you know where "replied" rates are really coming from.
Apollo.io: Include Seeds in Your Outbound Sequences
Apollo blends data + sending. Their Deliverability score is aggregate — your seed result is specific. Use both, trust the seeds.
Instantly: How to Seed Test Before Scaling to 1000 Emails/Day
Instantly makes scaling cold outreach easy — too easy. Seed tests on every campaign + rotation account catch the moment reputation starts to slip.
Lemlist: Add Seed Emails to Every Cold Outreach Sequence
Lemlist leans on personalisation to reach inbox. Seed addresses verify the personalisation actually helped — per provider, per campaign.
Flodesk: Beautiful Emails — But Do They Hit Inbox? Seed Test Them
Flodesk designs for creators. Image-heavy templates are Promotions-tab bait. Seed tests tell you when a gorgeous design torpedoed your open rate.
Buttondown: Minimalist Newsletter + Inbox Placement Check
Buttondown skews to indie newsletter writers. Small lists, loyal readers — but spam placement still happens. Seed-test before every send.
Ghost Newsletter: Seed Testing for Independent Publishers
Ghost publishers own their list and their deliverability. Seed addresses are the only no-vendor way to verify inbox placement per issue.
Substack: Can You Even Test Deliverability? (Yes, Here is How)
Substack gives writers little deliverability control. But you can still subscribe seed addresses to your own publication and measure placement.
Beehiiv: Newsletter Deliverability — Are Your Seeds Hitting Inbox?
Beehiiv grew from zero to 750K newsletters fast. Their shared sending pool changes over time. Seed-test every issue to catch pool-reputation drift.
Omnisend: E-commerce Email + SMS — Test Email Leg With Seeds
Omnisend runs both SMS and email for DTC stores. The email leg is where spam happens. Seed addresses on every flow make the problem visible.
Moosend: How to Verify Inbox Placement With Seed Addresses
Moosend is affordable and popular in Europe. Dashboard reports delivered — seeds report where. Add both and you close the loop.
Campaign Monitor: Seed Test Your Branded Emails
Campaign Monitor caters to agencies. Every client send is a brand risk if it lands in spam. Seed addresses catch it before clients complain.
MailerLite: Free Newsletter Tool + Free Inbox Placement Test
MailerLite's free tier is generous. Pair it with our free seed-testing tool and you have a zero-cost stack that still produces real deliverability data.
Drip: E-commerce Email Seed Testing Before Automated Workflows
Drip automates DTC email journeys. A bad workflow burns subscriber trust silently. Seeds on every workflow let you audit placement non-interactively.
AWeber: Inbox Placement Testing With Seed Emails
AWeber is an old guard ESP with a mature reputation system. Seed addresses show you when shared IP reputation shifts affect your deliverability.