biosafety level: inbox · handled by mail.sb

Warning: this address is catching.

☣.uz — one biohazard trefoil, three characters of punycode, mailboxes cultured at mail.sb. Spreads by word of mouth. No cure planned.

Claim you@☣.uz → read the lab report ↓

▲ live culture — wave your cursor over the dish. it likes attention.

biohazard specimen
specimen id
you@☣.uz
collected
2026-07-31
handler
MAIL.SB
01 / genome

Strain & sequence

DNS is a cleanroom built in 1983 — nothing but ASCII gets through the airlock. So browsers run punycode: the live symbol is sequenced into three safe characters and labelled xn--. The strain below and its sequence are the same organism.

live strain · what you see ☣.uz
sequenced · what dns reads xn--k4h.uz
  1. ☣
  2. U+2623
  3. punycode "k4h"
  4. label xn--
  5. xn--k4h.uz

flip 🔒 containment in the toolbar to read the whole page in the sealed, machine-safe form — the specimen bag gets stamped too.

02 / assay

The lab report is in.

No marketing was harmed in producing these results — they come straight from the live DNS. Replicate them in any terminal; peer review is encouraged.

uz clinical dns laboratory · accession № 2623
Assay report — specimen ☣.uz
testresultflag
dig ☣.uz MX +short10 mail.mail.sb.positive
dig xn--k4h.uz MX +short10 mail.mail.sb.positive
python3 -c "print(b'k4h'.decode('punycode'))"☣confirmed
interpretation: patient is contagiously reachable. mail sent to this domain will be delivered and remembered.
positive
for mail

// results drawn from the living DNS on 2026-07-31. no fabricated data — this lab has standards.

03 / handling

Handling protocol: why carry it?

Viable culture

Mailboxes are cultured by mail.sb — send, receive, incubate in any client. The assay above shows this domain's live MX: mail.mail.sb.

Anonymous donors

mail.sb collects a name, not an identity — registration asks no personal questions. Gloves are pre-fitted: SPF, DKIM and DMARC come configured.

Maximum transmissibility

The biohazard symbol was engineered in 1966 to be memorable and meaningless — a design brief your email address now inherits. One exposure and the recipient carries it for life.

Contained fallback

Internationalized domains are certified lab equipment (IDNA). Modern clients render ☣; older instruments read the sealed label xn--k4h.uz — same organism, safely bagged.

04 / intake

Exposure questionnaire

patient intake — answer honestly, breathe normallyform 2623-b
Q·01Is this a real, working email domain?

Yes. ☣.uz is registered, resolves, and its MX records point at mail.mail.sb — the exchanger run by mail.sb. Addresses on it send and receive like any ordinary mailbox. Section 02 is the lab's own assay of the live records.

Q·02Will everyone see the symbol?

Modern browsers and mail clients render ☣.uz in full. Instruments calibrated before emoji display the sealed form, xn--k4h.uz — the same domain, safely labelled. That fallback is exactly why symbol domains can exist.

Q·03Why the biohazard symbol?

It is the only logo in history designed to be maximally memorable while meaning nothing — drawn for Dow in 1966, admitted to Unicode in 1993. That is precisely the job description of a great email address.

Q·04How do I get infected — I mean, registered?

Visit mail.sb — the lab that cultures mailboxes on this domain — and choose a name. Bring curiosity, not ID; the intake form has exactly one field.

Be uncontainable.

One symbol. Three characters of punycode. Zero herd immunity to your sender line.

Culture yours at mail.sb →

free — the lab asks for a name, not a passport.