Overview
mail.sinnerops.fyi · server health and delivery
DNS authentication
Inbox
Read mail delivered to any mailbox
Select a message to read
Temp Mail
Disposable inboxes that self-destruct — built for signup & OTP flows
Pick an address to watch its inbox
History
Every message sent through the Mail API
| Sent | From | To | Subject | Key | Opens | Clicks | Status |
|---|
Domains
Add any domain for sending & temp mail. Porkbun domains auto-configure; others show records to add.
Accounts
Mailboxes on sinnerops.fyi
| Usage | Actions |
|---|
Aliases
Forwarding rules and catch-all routing
Catch-all —
Route unknown addresses to one mailbox
| From | To |
|---|
Queue
Deferred and pending outgoing mail
| ID | Size | Date | Sender | Recipient | Reason |
|---|
Bounces
Failed and delayed deliveries from the mail log
| Time | Recipient | Status | Reason |
|---|
Blacklist
Reject mail from these senders at the edge
| Blocked | Note | Added |
|---|
DKIM
DomainKeys signature for sinnerops.fyi
Record: mail._domainkey.sinnerops.fyi
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DNS
Live check of authentication records
Mail API
Transactional + temp email service · mail-api.sinnerops.fyi
Usage · last 14 days
API keys
| Name | Prefix | Scopes | Created | Last used | Status |
|---|
Public temp mail
Public disposable inbox page
Anyone can create throwaway inboxes at mail-api.sinnerops.fyi/temp
SMTP relay
Host
smtp.sinnerops.fyi
Port
587 STARTTLS
Username
no-reply@sinnerops.fyi
Password
MailApi!2026xK9
Quick reference
Send email
POST /v1/emails
{
"to": ["a@b.com"],
"subject": "Hi",
"html": "<p>Hi</p>"
}
Create temp inbox
POST /v1/temp/inboxes
Authorization: Bearer <temp-key>
{ "minutes": 60 }
Poll temp messages
GET /v1/temp/inboxes/
{address}/messages
Security
Two-factor authentication for this dashboard
Two-factor authentication —
Require a time-based code at sign-in using any authenticator app.
Logs
Live tail from the mail server
Compose
Write and send a branded email
Mailers
Saved sender identities — pick one when composing
| Name | Shows as | Address | Reply-To |
|---|
Templates
Reusable emails with ${variable} substitution
| Name | Slug | Subject | Updated |
|---|
Suppression
The API will never send to these addresses
| Reason | Added |
|---|
Deliverability
Inbox-placement readiness and blocklist status
Score
—
Blocklists (RBL)
| Blocklist | Status |
|---|
DMARC reports
Aggregate reports sent to postmaster@sinnerops.fyi, parsed on demand
Sending sources
| Source IP | Messages | DKIM pass | SPF pass |
|---|
Users
Dashboard accounts and their access level
| Role | Added |
|---|
Backups
Snapshots of mailboxes, config, and databases · daily at 03:00, last 7 kept
| Archive | Size | Created |
|---|
Audit log
Recent administrative actions
| Time | Action | Detail |
|---|
Branding
Company identity and the signature appended to outgoing mail
Preview · letterhead + body + signature
Docs
How to add a domain, set up DNS, and use everything
What this is
A self-hosted mail server on mail.sinnerops.fyi. Send and receive mail on any domain you point here, create disposable inboxes, and send transactional email over a REST API or SMTP. Everything below is managed from this dashboard.
1 · Add a domain
Step 1. Go to Domains → Add domain and enter your domain (e.g. example.com).
Step 2. The server generates a DKIM key for it automatically.
Step 3a — Porkbun domains: if the domain lives in the connected Porkbun account, all four DNS records are written for you. Done.
Step 3b — any other registrar: add the four records below at your DNS host, then watch them turn green on the Domains page (DNS can take a few minutes to propagate).
Step 2. The server generates a DKIM key for it automatically.
Step 3a — Porkbun domains: if the domain lives in the connected Porkbun account, all four DNS records are written for you. Done.
Step 3b — any other registrar: add the four records below at your DNS host, then watch them turn green on the Domains page (DNS can take a few minutes to propagate).
| Type | Host / Name | Value | Purpose |
|---|---|---|---|
| MX | @ | mail.sinnerops.fyi (priority 10) | Routes inbound mail to the server |
| TXT | @ | v=spf1 mx a:mail.sinnerops.fyi ~all | SPF — authorizes the server to send |
| TXT | mail._domainkey | v=DKIM1; … (shown per-domain) | DKIM — signs outbound mail |
| TXT | _dmarc | v=DMARC1; p=none; rua=mailto:postmaster@sinnerops.fyi | DMARC — reporting policy |
The exact DKIM value for each domain is shown on its card in Domains — copy it from there. The record Host is written as your registrar expects it; @ means the root/apex, and some hosts want the full name (e.g. _dmarc.example.com).
2 · Disposable (temp) mail
From the dashboard
Open Temp Mail → New address, pick a domain and lifetime. Click the address to watch its inbox refresh live. It self-deletes when it expires.
Public page
Flip the toggle on the Mail API page to open mail-api.sinnerops.fyi/temp for anyone — no login.
Over the API
POST /v1/temp/inboxes
Authorization: Bearer <temp-key>
{ "minutes": 60, "domain": "example.com" }
GET /v1/temp/inboxes/{address}/messages
3 · Send email (API)
Create a key on the Mail API page (scope Send email), then:
curl
curl https://mail-api.sinnerops.fyi/v1/emails \
-H "Authorization: Bearer $KEY" \
-H "Content-Type: application/json" \
-d '{
"to": ["user@example.com"],
"subject": "Hello",
"html": "<p>Hi there</p>"
}'
Python
import httpx
httpx.post(
"https://mail-api.sinnerops.fyi/v1/emails",
headers={"Authorization": f"Bearer {KEY}"},
json={"to": ["user@example.com"],
"subject": "Hello",
"html": "<p>Hi there</p>"})
Fields: to (list), subject, and one of html / text / template_id. Optional: from_addr, cc, bcc, reply_to, template_vars, attachments. Full reference at /docs.
4 · API keys & scopes
| Scope | Grants |
|---|---|
| Send mail, read your own send history, manage templates/webhooks | |
| temp | Create and poll disposable inboxes |
| admin | Dashboard-only master key — usage, history, settings |
Keys are shown once at creation — copy immediately. Revoke anytime from the Mail API page; apps using a revoked key lose access instantly.
5 · SMTP relay
Prefer SMTP over REST? Point any app at:
Host smtp.sinnerops.fyi
Port 587 (STARTTLS)
Username no-reply@sinnerops.fyi
Password MailApi!2026xK9
6 · Other controls
Catch-all
Aliases page — route every unknown address on a domain to one mailbox.
Blacklist
Block a sender address or whole domain; rejected at the edge before delivery.
Quota
Set a size cap per mailbox on the Accounts page (e.g. 1G, or 0 for unlimited).
Two-factor
Security page — scan the QR with any authenticator to require a code at sign-in.
Deliverability notes
PTR / reverse DNS for 38.49.216.244 is not yet set — it must be requested from the VPS provider. Until then some providers (Gmail, Outlook) may be stricter on inbound from this server.
DMARC starts at p=none (monitor only). Once a domain's DKIM and SPF verify green, you can tighten it to p=quarantine.
DMARC starts at p=none (monitor only). Once a domain's DKIM and SPF verify green, you can tighten it to p=quarantine.