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The inbound ledger · @unisoftbox.com

Forwards your email To your webhook.

Give every service its own address. UnisoftBox receives the mail on its own SMTP server, parses it, checks the sender, files it with AI and hands your app clean JSON. Every message stays on the ledger.

Max message
25MB
Attachments / msg
250
Days in trash
30d
  • SMTP
  • JSON
  • SPF · DKIM · DMARC
  • AI filing
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How it works

One message, five checkpoints, zero black boxes.

Scroll to follow a message through the pipeline. Every step leaves a record you can inspect.

  1. 01

    Receive

    Our SMTP server accepts mail for your addresses and stores the raw message, content-addressed.

  2. 02

    Parse

    Headers, text, HTML and every attachment are extracted. Broken MIME is repaired, never dropped.

  3. 03

    Verify

    SPF, DKIM, DMARC and ARC are checked so forged senders are flagged before you trust them.

  4. 04

    File

    AI reads your folder descriptions and files the message where it belongs.

  5. 05

    Deliver

    The result is ready as clean JSON for your webhook, with the full record kept here.

The payload

Email in. JSON out.

No MIME parsing, charset guessing or base64 in your code. You get a normalized document: readable text, the HTML, attachment metadata and the sender verdict.

POST application/json
{
"id": "msg_7f3a9c",
"mailbox": "support@unisoftbox.com",
"from": {
"name": "Ada Lovelace",
"address": "ada@lovelace.example"
},
"subject": "Invoice INV-1042",
"received_at": "2026-11-07T14:08:21Z",
"text": "Hi team,\nThe invoice for October is attached.\n– Ada",
"html": "<p>Hi team,</p><p>The invoice for October…</p>"
}
Sender verdicts · sample SPF · DKIM · DMARC
  • billing@vendor.example spf pass · dkim pass · dmarc pass Verified
  • team@newsletter.example spf softfail · dkim pass Verified
  • alerts@legacy.example no authentication Unverified
  • ceo@yourco-payments.example dmarc fail · policy reject Likely forged

Sender verification

Know who really sent it.

Every message is checked against its domain's SPF, DKIM and DMARC records, with ARC and a spam score when available. Forged mail is flagged before anyone acts on it, and the verdict travels with the payload.

  • Private relays handled. When a proxy hides the sender, SPF is skipped instead of guessed.
  • Never blocks ingestion. If a checker is down, the message is kept and marked unchecked.

Specs

The numbers, on the record.

Limits enforced by the server

Per message

25MB

Larger mail is refused at the SMTP level, before any upload.

Attachments per message

250

Each stored once, under its SHA-256, and served by signed link.

Searchable text

512KB

Bodies are indexed for full-text search up to this size.

On any failure

451

A temporary error makes the sender retry, so mail is never silently lost.

Trash retention

30d

Deleted mail can be recovered for 30 days, then purged with its files.

Sender checks

4

SPF, DKIM, DMARC and ARC, plus a spam score when available.

Try it

Send one email. Watch the ledger fill.

swaks --to support@unisoftbox.com --from you@example.com
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