Everything else — CPU count, brand name, marketing copy — is secondary to these.
Shared IPs mean your deliverability depends on everyone else sending from the same address. A dedicated IP means your reputation is entirely your own to build or damage.
Many cloud providers block Port 25 by default and require a multi-day manual review to unblock it. Look for a host where it's open for legitimate use from day one.
A PTR record that matches your sending domain passes Forward-Confirmed Reverse DNS checks that many inbox providers run.
Bulk-sending software writes constantly to the database and mail queue. NVMe storage keeps that from becoming the bottleneck as your list grows.
MailWizz, Mautic, Postal and PowerMTA all assume you can configure PHP, cron, and your MTA of choice directly — not through a locked-down control panel.
A high core count or an oversized RAM allocation won't fix a shared IP with a poor sending history, and no amount of server tuning replaces proper SPF, DKIM and DMARC configuration on your own domain. Server infrastructure gets you a fair starting point; sending practices — opt-in lists, low complaint rates, gradual IP warm-up — determine long-term deliverability.
| Software | Typical Use | What It Needs From the VPS |
|---|---|---|
| MailWizz | Self-hosted campaign & list management | PHP/MySQL stack, cron, Port 25 or SMTP relay, dedicated IP |
| Mautic | Marketing automation | PHP/MySQL, cron, SMTP relay integration, moderate RAM |
| Postal | Self-hosted transactional/bulk mail server | Docker or native install, MariaDB, Port 25, dedicated IP |
| PowerMTA | High-volume commercial MTA | Higher CPU/RAM, multiple IPs common, Port 25, root access for licensing |
| Sendy | Lightweight campaign sender using Amazon SES | Minimal PHP/MySQL, works even without Port 25 since SES relays |
| Listmonk | Self-hosted newsletter/list manager (Go binary) | PostgreSQL, low resource footprint, SMTP relay or Port 25 |
For a small opt-in list, a Basic or Standard plan with a dedicated IP and Port 25 can work; larger lists benefit from more RAM and NVMe storage.
No, if you relay through a third-party SMTP API like SES, outbound Port 25 from your own VPS isn't required.
This depends on IP reputation, receiving-server rate limits and your own sending policy far more than raw server specs; a well-warmed dedicated IP can typically send thousands of opt-in emails per day.
Yes, every plan includes a dedicated IPv4 address, open Port 25 and custom rDNS support suited to MailWizz, Mautic, Postal and PowerMTA.
Dedicated IPv4, open Port 25 and NVMe storage — starting at $4.95/month.
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