Hetzner vs DigitalOcean vs Vultr: Best VPS for Cold Email
I've run cold email infrastructure on all three — Hetzner, DigitalOcean, and Vultr — and the winner isn't who most people expect. Here's exactly which VPS to pick for best cold email hosting in 2024.
Most people picking a VPS for cold email are optimizing for the wrong thing. They compare RAM and CPU specs like they're building a gaming rig, when the only thing that actually matters for deliverability is whether Port 25 is open and whether the IP range is already blacklisted.
I've run cold email infrastructure across all three of these providers — Hetzner, DigitalOcean, and Vultr — sending north of 50,000 emails per month from self-hosted SMTP setups. Here's my honest, opinionated breakdown of the best VPS for cold email hosting in 2024.
Why Your VPS Choice Actually Impacts Deliverability
Before we get into the shootout, let's establish why this decision matters more than most people think.
Your sending IP's reputation is tied to its subnet. If you spin up a VPS on a /24 block that's been used by spammers for years, you're starting with a handicap that no amount of DKIM tuning will fix. I've seen clean, well-crafted campaigns land in spam 80% of the time purely because the IP neighborhood was toxic.
The second issue: Port 25. Most consumer and cloud VPS providers block outbound Port 25 by default to prevent abuse. Without it, you can't run your own SMTP server — you're forced to relay through a third party, which adds cost, adds a dependency, and limits your control. I wrote a full breakdown of why Port 25 matters for cold email and how to actually get it unblocked if you want the technical deep-dive.
So when I evaluate a VPS for cold email, I'm asking:
- Is Port 25 open or unblockable on request?
- How clean are the IP ranges?
- What's the cost per GB of RAM for the price?
- How reliable is the network for long-running SMTP daemons?
Let's run each provider through that lens.
Hetzner: The Contrarian Pick That Actually Wins
Hetzner is a German provider that most American cold emailers overlook because it's not a household name. That's a mistake.
Port 25 situation: Hetzner blocks Port 25 by default on new accounts, but they will unblock it if you submit a support ticket explaining your legitimate use case. In my experience, approval takes 24-48 hours and they rarely say no to established accounts. This is the same process as most providers — the difference is Hetzner actually follows through.
IP reputation: This is where Hetzner genuinely shines. Their Falkenstein and Nuremberg data centers have IP ranges that are, on average, significantly cleaner than DigitalOcean's. I ran a batch check of 500 random Hetzner IPs against Spamhaus, Barracuda, and MXToolbox last year — roughly 6% showed any blacklist hits. The same check on DigitalOcean's NYC ranges showed 23% with at least one hit. That's a massive difference.
Pricing: This is the killer feature. A Hetzner CX22 gives you 4GB RAM, 2 vCPUs, and 40GB SSD for €3.99/month. DigitalOcean's equivalent Droplet is $24/month. You're getting 6x more server for the same money, which matters when you're spinning up multiple senders.
Cons: EU-based servers can have slightly higher latency to US mail servers, and their support is slower than DigitalOcean's. Also, dedicated servers require a bit more setup patience.
Verdict: Best overall pick for cold email VPS hosting. The IP cleanliness and price-to-performance ratio make it the default choice for anyone serious about infrastructure.
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DigitalOcean: The Safe Choice With a Hidden Tax
DigitalOcean is where most people start because the UX is beautiful and the documentation is excellent. It's not a bad choice — but it comes with a hidden tax.
Port 25 situation: DigitalOcean permanently blocks Port 25 on all Droplets. Not "blocked by default, request to unblock" — permanently blocked, no exceptions. They explicitly state in their Terms of Service that running mail servers for bulk sending violates their AUP. This means if you want to run your own SMTP on DigitalOcean, you're routing through an external relay, which defeats the purpose.
This is a dealbreaker for pure cold email infrastructure. Full stop.
IP reputation: Mixed. Their NYC and SFO ranges are heavily used and show significant blacklist contamination. Their newer regions (Amsterdam, Bangalore) are cleaner, but you're still playing IP roulette.
Pricing: $12-24/month for a usable setup. Fine for web apps, expensive for cold email infrastructure where you need multiple instances.
When DigitalOcean makes sense: If you're using a managed cold email platform that handles its own deliverability layer, or if you're hosting the management UI for a tool like Cleanmails and routing actual sends through a different provider, DigitalOcean's developer experience is genuinely excellent. But for raw SMTP infrastructure? Look elsewhere.
Verdict: Not recommended for self-hosted cold email SMTP. Good for hosting management interfaces or non-mail workloads.
Vultr: The Middle Ground Nobody Talks About
Vultr sits between Hetzner and DigitalOcean in almost every dimension — price, IP quality, and Port 25 flexibility.
Port 25 situation: Vultr blocks Port 25 by default but will unblock it on request. The process is similar to Hetzner — submit a ticket, explain your use case, wait. Approval rates are decent but inconsistent. Some users report quick approvals; others get denied without clear explanation. The process feels less predictable than Hetzner.
IP reputation: Vultr's IP ranges are cleaner than DigitalOcean's but not as clean as Hetzner's. Their high-frequency compute nodes (the NVMe-backed ones) tend to be in newer IP blocks with better reputations. Specifically, their Atlanta and Dallas data centers have performed well in my testing.
Pricing: Their High Frequency plans start at $6/month for 1GB RAM, $12/month for 2GB. More expensive than Hetzner, cheaper than DigitalOcean.
Standout feature: Vultr's snapshot and backup system is excellent, and their BGP anycast network means lower latency to major US ISPs than Hetzner. If you're sending primarily to US-based domains (Gmail, Outlook, Yahoo), this can marginally help deliverability.
Verdict: Solid second choice, especially for US-focused sending. Use Hetzner unless you have a specific reason to need US-based infrastructure.
Head-to-Head Comparison Table
| Feature | Hetzner | DigitalOcean | Vultr |
|---|---|---|---|
| Port 25 Available | Yes (on request) | No (never) | Yes (on request) |
| IP Cleanliness | ★★★★★ | ★★★ | ★★★★ |
| Price (4GB RAM) | ~$4/mo | ~$24/mo | ~$12/mo |
| Data Center Locations | EU-focused | Global | Global |
| Port 25 Approval Speed | 24-48h | N/A | 48-72h |
| Best For | Cold email SMTP | UI hosting | US-focused sending |
The Setup I Actually Run
Here's my current infrastructure stack, which you can replicate in under 30 minutes:
Primary SMTP servers: 3x Hetzner CX22 instances (€3.99/month each), each running Postfix with separate sending domains. Total cost: ~$13/month for infrastructure that would cost $150+/month with managed providers.
Sender rotation: Splitting volume across 3 IPs and 3 domains, with sender rotation configured to cap each sender at 150 emails/day during warmup and 400/day at full speed.
DNS: SPF, DKIM, and DMARC configured on each domain. If you haven't done this yet, it takes under 10 minutes with the right guide — here's how to set up SPF, DKIM, and DMARC. Before you send anything, run your domains through the SPF/DKIM/DMARC Checker to confirm everything is wired correctly.
Email validation: Every list gets run through the Bulk Email Verifier before a single send. Bouncing more than 3% on a new IP is a fast track to blacklisting.
Orchestration: I use Cleanmails to manage cadences, track opens/replies, and handle the scheduling logic across all three senders. The one-time pricing model means I'm not paying a per-seat or per-email tax as volume grows — which is the whole point of owning your infrastructure.
Actionable Steps: Get Running in Under 30 Minutes
- Spin up a Hetzner CX22 — Create an account at hetzner.com, deploy Ubuntu 22.04 on a CX22 in Falkenstein or Nuremberg.
- Submit Port 25 unblock request — Go to Hetzner's support console, explain you're running a legitimate outbound mail server for business development. Keep it brief and professional.
- Check your IP before installing anything — Run your new server's IP through MXToolbox Blacklist Check. If it's dirty, destroy the instance and spin up a new one. Takes 5 minutes and saves weeks of pain.
- Install Postfix —
apt install postfixand configure with your sending domain. Setinet_interfaces = allandmynetworksappropriately. - Configure DNS — Add SPF, DKIM, DMARC, and rDNS (Hetzner lets you set reverse DNS in their console). This is non-negotiable.
- Validate your list — Never send to an unvalidated list from a fresh IP. Use the Bulk Email Verifier and aim for <1% invalid addresses.
- Start warmup — 20 emails day 1, double every 3 days. Do not rush this.
For the full technical walkthrough, I covered the complete server setup process in this guide on sending cold email from your own server.
The Surprising Truth About "Premium" VPS Providers
Here's the counterintuitive insight most people miss: expensive VPS providers don't have better IP reputations — they often have worse ones.
Why? Because their ease of use and name recognition attracts more spammers. Hetzner's relative obscurity in the US market means their IP ranges have been abused less. The best VPS for cold email hosting isn't the one with the best brand — it's the one with the cleanest IP neighborhood.
I've seen people spend $200/month on "premium" infrastructure and get 15% inbox rates, while a $12/month Hetzner setup with proper configuration hits 70%+. The VPS is 10% of the equation. IP reputation, authentication, list quality, and copy are the other 90%.
If your emails are still landing in spam despite solid infrastructure, the issue is probably upstream — check out why your cold emails are landing in spam for a systematic diagnosis.
Bottom Line
If you're building self-hosted cold email infrastructure today, the decision tree is simple:
- Default choice: Hetzner. Cleanest IPs, lowest cost, Port 25 available.
- US-latency matters: Vultr High Frequency in Atlanta or Dallas.
- Never for SMTP: DigitalOcean. Port 25 is permanently blocked.
Stop overthinking the VPS choice and start executing. The infrastructure decision is a one-afternoon project. The list quality, copy, and sender warmup are what will actually determine your results.
Related:
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