# Mail server | NulNet > Self-host Mailcow, Postfix or Stalwart on a VPS with port 25 open and editable PTR/FCrDNS. No ID step. Zurich or Amsterdam. Crypto invoice. No ID at signup. Source: https://nulnet.com/solutions/mail-server/ [Home](https://nulnet.com/) / [Solutions](https://nulnet.com/solutions/) / Mail server Workload playbook # Mail Server VPS — Port 25, PTR, No KYC, Crypto ![NulNet mail and Matrix abstract: envelope and chat glass](https://nulnet.com/img/theme-mail.png) Self-host Mailcow, Postfix or Stalwart on a VPS with port 25 open and editable PTR/FCrDNS. No ID step. Zurich or Amsterdam. Crypto invoice. Published 2026-08-30 · Updated 2026-09-08 · NulNet Editorial **Short answer** Rent a VPS where port 25 ships open in both directions and PTR is editable from the panel, then install Postfix, Mailcow or Stalwart from their docs. You operate the MTA and earn deliverability at Gmail and the rest on your own record. NulNet: VPS from $3/mo and dedicated from $30.80/mo annual. The map spans twenty-one locations — Reykjavik (Iceland) and Zurich (Switzerland) among them, plus Singapore, Dubai, Cape Town and fourteen others. Signup is email plus a 12-character password, or token-only. No KYC. Checkout is crypto-only across BTC, XMR, ETH, BNB, SOL, LTC, TRX, XRP, DOGE, DASH, ADA, GRAM (TON), and USDT (TRC-20/ERC-20/BEP-20/SPL). No payload or guest traffic logs; connection metadata ≤24h. DDoS included. One SKN company, one crypto checkout. Deploy at https://nulnet.com/deploy/. ## What people actually run [Postfix documentation](https://www.postfix.org/documentation.html) remains the common MTA; [Stalwart Mail Server](https://stalw.art/docs/) is the modern all-in-one, and Mailcow wraps the classic stack in a panel. The platform facts stay the same under any of them: port 25 open inbound and outbound with no unblock ticket, PTR editable after deploy, FCrDNS alignment on you. Reputation is the part nobody sells — whatever the payment rail, a fresh IP starts cold and warms by what it sends. VPS from $3* (fund $50+), storage 1–5 TB NVMe from $24/mo annual-eff, dedicated with IPMI from $30.80/mo. Crypto invoice, no KYC. [Launch now](https://nulnet.com/deploy/?kind=vps&plan=business/) ## Playbook From invoice to an MX - Warden to start. Dedicated if you are a public MX for many domains. - Install [Postfix documentation](https://www.postfix.org/documentation.html) or [Stalwart Mail Server](https://stalw.art/docs/). Set SPF/DKIM/DMARC on your domain. - Switzerland is the process default. Netherlands if you want AMS-IX and accept EU rack law. ## Sizing and placement A single-domain MTA is a light process — Warden ($19.00 list, $15.20 annual-eff) carries queues, spam filtering and webmail comfortably. A public MX for many domains wants isolation: Shield metal ($38.50 list, $30.80 annual-eff) is the catalog's mail pick with 8c/16t, 32 GB ECC and a clean IPv4, per the [dedicated catalog](https://nulnet.com/dedicated/). Placement: Zurich when process quality is the story, Amsterdam when EU recipients dominate latency budgets. Before ordering, the [port-25 ranking](https://nulnet.com/best-port-25-vps-no-kyc/) compares hosts that still ship the port open. ## Limits The host will not whitelist your domain at Gmail or pre-warm any IP — deliverability is earned by SPF/DKIM/DMARC discipline and sending history. Spam and CSAM are AUP failures that end the account; a mail server changes neither fact. Is PTR editable? Yes, from the panel once the VPS or dedicated unit is provisioned — set it to match the MX hostname and keep FCrDNS aligned before the first send. Can the box be an IPv6 MX? Yes. Dual-stack is standard on every VPS: an AAAA record plus the /64 that ships with each plan covers IPv6 delivery alongside IPv4. Is port 25 inbound and outbound open? Yes, on VPS and dedicated alike, with no unblock ticket and no throughput tax — the port ships open the way the ranking pages assume it no longer does. Do you KYC mail operators? No. An email or a 32-character token plus a 12-character password opens the account, crypto settles it — and the reputation work at Gmail stays yours either way. ## Primary sources - [Postfix documentation](https://www.postfix.org/documentation.html) - [Stalwart Mail Server](https://stalw.art/docs/) ## Related guides - [Minimum-data no-KYC checkout](https://nulnet.com/guides/anonymous-vps-crypto-no-kyc/) - [Buy a VPS with crypto](https://nulnet.com/buy-vps-with-crypto/) - [No-KYC VPS: requirements and limits](https://nulnet.com/no-kyc-vps/) - [Pay with Monero](https://nulnet.com/monero-vps/) - [Offshore VPS](https://nulnet.com/offshore-vps/) - [VPS vs dedicated bare-metal](https://nulnet.com/guides/vps-vs-dedicated/) - [Best no-KYC VPS 2026](https://nulnet.com/best-no-kyc-vps-2026/) - [FAQ: crypto VPS](https://nulnet.com/guides/faq-crypto-vps/) ## Checkout facts - **Price** VPS from $3/mo. Dedicated from $30.80/mo. - **Identity** No KYC. Token-only (no email) or email plus a 12-character password. No passport, phone, or card. - **Payment** Sixteen ways to settle, none of them a card: XMR and BTC lead, ETH, SOL, LTC, BNB and TRX follow, then XRP, DOGE, DASH and ADA, GRAM (TON) for Telegram-adjacent rails, and USDT on four networks — TRC-20, ERC-20, BEP-20, SPL. Live-rate invoice. - **Logs** No payload / no guest traffic logs. Billing and panel actions retained. Connection metadata ≤24h. - **Platform** KVM on ECC and local NVMe. DDoS filtering included. Facilities in 21 cities across four continents — the locations table lists each one's tier, uplink and governing law. Need Iceland or Switzerland plus no KYC? Those two carry a published premium (+20% / +35%); every other flag stays at base list. Pay BTC, USDT, XMR, BNB, XRP, GRAM (TON) or 10 more. Open deploy to pick a plan. ## Ready to launch? Build the box — VPS, storage or bare metal — create the password, pay the invoice that follows. [Launch now](https://nulnet.com/deploy/?kind=vps&plan=business/)[Dedicated](https://nulnet.com/dedicated/)