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Blindrelay signs and relays from your verified domain, reports delivery to your own stack, then lets go of the message.

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From: billing@ acme.example
To: ana@customer.example
Subject: Your November invoice

Hi Ana, your invoice for November is attached. Thanks for another good month with us.

Where it is now

Process memory. Not in Postgres. Not in Redis. Not in a log line.

DKIM-Signature

v=1; a=rsa-sha256; d=acme.example; s=br1; h=from:to:subject:date; bh=2jUSOH9NhtVGCQWNr9BrIAPreKQjO6Sn7XIkfJVOzv8=; b=dzdVyOfAKCdLXdJOc9G2q8LoXSlEniSbav+yuU4zGeeruD00lszZVoG4ZHRNiYzR

Relay

Your app API Blindrelay EU, RAM Recipient MX 250 2.0.0 OK

What remains

status: delivered
domain: acme.example
recipient: one-way hashes only
content: none
expires: 72 h

In your collector

email.sent.total +1 status=delivered email.delivery.latency 0.84 s webhook {"event":"delivered"}

Your domain's DKIM key signs the message while it sits in process memory. Body, subject and headers never reach our database.
sample message signed
From
billing@ acme.example
To
ana@customer.example
Subject
Your November invoice
Hi Ana, your invoice for November is attached. Thanks for another good month with us.
Where it is now
Process memory. Not in Postgres. Not in Redis. Not in a log line.
DKIM-Signature
```
v=1; a=rsa-sha256; d=acme.example; s=br1; h=from:to:subject:date; bh=2jUSOH9NhtVGCQWNr9BrIAPreKQjO6Sn7XIkfJVOzv8=; b=dzdVyOfAKCdLXdJOc9G2q8LoXSlEniSbav+yuU4zGeeruD00lszZVoG4ZHRNiYzR
```
Relay
Your app API Blindrelay EU, RAM Recipient MX 250 2.0.0 OK
What remains
status
delivered
domain
acme.example
recipient
one-way hashes only
content
none
expires
72 h
In your collector
email.sent.total +1 status=delivered email.delivery.latency 0.84 s webhook {"event":"delivered"}
One API call, or SMTP from the tools you already use. Relayed from your verified domain, on EU infrastructure.
```
POST /v1/send { "from": "billing@acme.example", "to": "ana@customer.example", "subject": "Your November invoice", "html": "<p>Hi Ana…</p>" }
```
sample message delivered
From
billing@ acme.example
To
ana@customer.example
Subject
Your November invoice
Hi Ana, your invoice for November is attached. Thanks for another good month with us.
Where it is now
Process memory. Not in Postgres. Not in Redis. Not in a log line.
DKIM-Signature
```
v=1; a=rsa-sha256; d=acme.example; s=br1; h=from:to:subject:date; bh=2jUSOH9NhtVGCQWNr9BrIAPreKQjO6Sn7XIkfJVOzv8=; b=dzdVyOfAKCdLXdJOc9G2q8LoXSlEniSbav+yuU4zGeeruD00lszZVoG4ZHRNiYzR
```
Relay
Your app API Blindrelay EU, RAM Recipient MX 250 2.0.0 OK
What remains
status
delivered
domain
acme.example
recipient
one-way hashes only
content
none
expires
72 h
In your collector
email.sent.total +1 status=delivered email.delivery.latency 0.84 s webhook {"event":"delivered"}
Once delivered, the content is gone. Our database only ever holds the address as one-way hashes. What remains is a status row that expires in 72 hours.
If the recipient's server defers delivery, the message and its address wait in an on-disk retry queue for up to 24 hours. Turn retries off and it stays in RAM: one attempt, no disk.
sample message discarded
From
billing@ acme.example
To
$2b$12$kW9xQeLmZ2uY8…
Subject
Your November invoice
Hi Ana, your invoice for November is attached. Thanks for another good month with us.
Where it is now
Process memory. Not in Postgres. Not in Redis. Not in a log line.
DKIM-Signature
```
v=1; a=rsa-sha256; d=acme.example; s=br1; h=from:to:subject:date; bh=2jUSOH9NhtVGCQWNr9BrIAPreKQjO6Sn7XIkfJVOzv8=; b=dzdVyOfAKCdLXdJOc9G2q8LoXSlEniSbav+yuU4zGeeruD00lszZVoG4ZHRNiYzR
```
Relay
Your app API Blindrelay EU, RAM Recipient MX 250 2.0.0 OK
What remains
status
delivered
domain
acme.example
recipient
one-way hashes only
content
none
expires
72 h
In your collector
email.sent.total +1 status=delivered email.delivery.latency 0.84 s webhook {"event":"delivered"}
Delivery signals go to your OTLP collector and webhooks. Dashboards and alerts live next to your app's metrics, not in a vendor's archive.
sample message reported
From
billing@ acme.example
To
$2b$12$kW9xQeLmZ2uY8…
Subject
Your November invoice
Hi Ana, your invoice for November is attached. Thanks for another good month with us.
Where it is now
Process memory. Not in Postgres. Not in Redis. Not in a log line.
DKIM-Signature
```
v=1; a=rsa-sha256; d=acme.example; s=br1; h=from:to:subject:date; bh=2jUSOH9NhtVGCQWNr9BrIAPreKQjO6Sn7XIkfJVOzv8=; b=dzdVyOfAKCdLXdJOc9G2q8LoXSlEniSbav+yuU4zGeeruD00lszZVoG4ZHRNiYzR
```
Relay
Your app API Blindrelay EU, RAM Recipient MX 250 2.0.0 OK
What remains
status
delivered
domain
acme.example
recipient
one-way hashes only
content
none
expires
72 h
In your collector
email.sent.total +1 status=delivered email.delivery.latency 0.84 s webhook {"event":"delivered"}

sample message in RAM

From: billing@ acme.example
To: ana@customer.example
Subject: Your November invoice

Hi Ana, your invoice for November is attached. Thanks for another good month with us.

Where it is now

Process memory. Not in Postgres. Not in Redis. Not in a log line.

DKIM-Signature

v=1; a=rsa-sha256; d=acme.example; s=br1; h=from:to:subject:date; bh=2jUSOH9NhtVGCQWNr9BrIAPreKQjO6Sn7XIkfJVOzv8=; b=dzdVyOfAKCdLXdJOc9G2q8LoXSlEniSbav+yuU4zGeeruD00lszZVoG4ZHRNiYzR

Relay

Your app API Blindrelay EU, RAM Recipient MX 250 2.0.0 OK

What remains

status: delivered
domain: acme.example
recipient: one-way hashes only
content: none
expires: 72 h

In your collector

email.sent.total +1 status=delivered email.delivery.latency 0.84 s webhook {"event":"delivered"}

0 messages in our archive.

There is no message archive to browse or breach, and no vendor dashboard reading your customers' mail.

CLI and Agent Plugin

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Compose in Gmail from your verified domain, or use Apple Mail, Outlook or Thunderbird. Same send path as the API. Mini or higher.

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Isolate reputation on your own IPv4, pin brands to streams and forward inbound mail to a mailbox. €12/mo excl. VAT on any paid plan.

EU deployment

Production runs in the EU by default.

Hosted in the EU
Made in the EU
No archive of your messages
Recipients stored as hashes
GDPR processor terms on every plan
Public delivery status

Explore the API reference , Gmail Send-as , dedicated IP , CLI , Agent Plugin , or Resend comparison .

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