Delyst.
Sign inStart free
Email infrastructure · Built in Tunis

Email marketing
with the deliverability
other ESPs hide.

Self-hosted KumoMTA. DKIM rotation every 90 days. BIMI in the inbox. An 8-point pre-send analyser that tells you why a campaign would land in spam. An AI copilot grounded in your own account's data, not in a third-party LLM's guesses.

Start free →See the plans
No credit card. 7-day money-back on paid plans.
delyst · dns audit
$ dig TXT _dmarc.delyst.com
;; v=DMARC1; p=reject; pct=100; rua=mailto:dmarc@delyst.com
$ delyst inspect yourdomain.com
✓ spf — aligned, lookup count 4/10
✓ dkim — verified (selector=mailer·2026q2)
✓ dmarc — enforced (p=reject, 100%)
✓ bimi — published · VMC chain valid
! mx — primary ok, secondary timeout 2103ms
✓ bounce rate 0.8% · complaint 0.02% · opens 31.4%
;; report built 12ms · next rotation in 47 days
Self-hosted KumoMTADKIM rotation · 90-dayBIMI + VMC readyDouble opt-in formsBounce classifier (3-layer + confidence)Pre-send 8-point analyserAI Deliverability CoachPostmaster Tools syncMulti-account (1 user · N customers)REST API + webhooksSend-time optimisationBot / proxy open detectionSelf-hosted KumoMTADKIM rotation · 90-dayBIMI + VMC readyDouble opt-in formsBounce classifier (3-layer + confidence)Pre-send 8-point analyserAI Deliverability CoachPostmaster Tools syncMulti-account (1 user · N customers)REST API + webhooksSend-time optimisationBot / proxy open detection
01 · Manifesto

Everything other ESPs don't want you to see.

[ What other ESPs hide ]
  • Bounce reason, stripped to a status code
  • Which ISP throttled your sends
  • Subscriber user-agent & open provenance
  • Your real DKIM rotation schedule
  • Shared-IP neighbours you'd rather not share
[ What Delyst exposes ]
  • Bounce classifier with a 0-100 confidence score
  • Per-ISP throttle reports, hour by hour
  • Full subscriber fingerprint on every event
  • DKIM rotation history, exportable as CSV
  • Dedicated IPs on Pro, no shared-IP neighbours
02 · Platform

Three pillars. One engine.

Build your campaign, send it through a stack you can see end-to-end, and let the AI copilot tell you — in your own data — what to fix before your next broadcast.

01 · Build & Send

A builder your designer won’t rewrite.

  • Drag-and-drop block editor (MJML under the hood)
  • 30+ premium templates, brandable in one sheet
  • Double opt-in subscription forms + embeds
  • Landing-page builder with the same blocks
  • A/B test subject lines, content, send-time
  • Send-test to any inbox in one click
02 · Deliverability Stack

The part most platforms outsource.

  • Self-hosted KumoMTA — no third party sees your mail
  • Automatic DKIM rotation, 90-day schedule
  • BIMI + VMC publishing, DMARC enforcement checks
  • 3-layer bounce classifier with confidence score
  • Google Postmaster integration — per-domain reputation
  • Pre-send 8-point analyser blocks risky sends
03 · Intelligence

The copilot that reads your own data.

  • AI Deliverability Coach (RAG + SSE streaming)
  • Proactive alerts: bounce spikes, DMARC drift, blacklist
  • Engagement scoring per subscriber, bot detection
  • Send-time optimisation from open-history
  • Real-time analytics: opens, clicks, inbox placement
  • Export anything as CSV — you own the data
03 · Features

The full surface. No footnote traps.

01

Custom email builder

Drag-and-drop blocks, MJML-rendered, inline CSS baked in. Responsive by default, brandable via a single kit.

02

Premium templates

A curated gallery that isn't the same five designs you've seen on every other ESP. Clone one, tweak a block, ship.

03

Self-hosted MTA

KumoMTA on infrastructure we control. Your content never touches a shared multi-tenant pipe. Lower latency, cleaner logs.

04

DKIM rotation

90-day automatic rotation with overlap so no mail is rejected during the cutover. Keys exported for audit at any time.

05

BIMI + VMC

Publish your logo to the inbox. We check DMARC enforcement, SVG profile and VMC chain before flipping it on.

06

Pre-send analyser

Eight checks (spam density, HTML ratio, images, links, subject, DNS, list hygiene, size) with weighted score.

07

Bounce classifier

Three layers: spam patterns, KumoMTA bounce class, DSN codes — with a 0-100 confidence score on each verdict.

08

Marketing automations

Triggers on signup, click, field-change, date anniversary. Branching, delays, split tests — no external Zapier tax.

09

AI Deliverability Coach

Reads your own account data, surfaces the two or three issues that actually move the needle. RAG-grounded, streaming.

10

Postmaster Tools

One-click OAuth to Google Postmaster. Inbox placement, spam rate, FBL domain reputation — in the same dashboard.

11

Multi-account

One login, many customers. Switch accounts in a click, invite teammates with editor / viewer roles, keep audit logs.

12

REST API + webhooks

Everything in the UI is exposed on a typed REST API. Webhooks for subscribe, campaign, bounce, complaint events.

04 · Pre-send analyser

We tell you before you hit send.

Eight weighted checks scanned in a second. Any critical fail and the send button turns red — not a grey suggestion tooltip. Every threshold is tunable by your admin, not hard-coded in our SDK.

Tuned by you · not by us
87
Deliverability score
2 warnings · 0 critical · ready to send
DNS health — SPF, DKIM, DMARC
Fully verified, sending enabled
pass
Spam-word detection
Found 1 trigger · consider rephrasing
warn
Link analysis
12 links · unsubscribe present · no shorteners
pass
Subject line
48 chars · 1 emoji · no ALL CAPS
pass
List hygiene
0.4% bounce rate · 2,412 confirmed subscribers
pass
HTML / text ratio
18% text · aim for 25%+ to avoid filters
warn
Content size
64 KB · well under Gmail's 102 KB clip
pass
Image alt coverage
All 8 images have alt text
pass
05 · By the numbers
65+
Per-ISP shaping profiles pre-configured — Gmail, Yahoo, Outlook, Proton, Fastmail…
8
Weighted checks run by the pre-send analyser on every campaign.
90d
DKIM rotation cadence with key overlap so nothing breaks mid-cut.
<300ms
Typical API p50 latency — your integrations stay snappy.
0
Shared-IP neighbours on Pro — warmup is yours alone.
15+
Knowledge-base articles embed the AI copilot's RAG context.
06 · Principles

Four things we'll never do.

No dark patterns.

Unsubscribe is one click. Cancellation is in the UI. No retention team paid to trap you on a phone call.

No shared-IP roulette.

Pro plans run on dedicated IPs warmed automatically. Starter and Growth share a pool of verified senders only.

No format lock-in.

Templates export as MJML or raw HTML. Subscribers as CSV. Campaigns as JSON. Leave us and your data leaves too.

No made-up deliverability score.

Every number in the analyser has a source (DNS lookup, DB count, threshold admin can read). No opaque 'AI score'.

Ready to send

Every inbox tells a story.
Yours should be worth reading.

Start a free account. Import a list. Ship a campaign before lunch. We'll send the first 500 emails for free.

Start free →Compare plans