Skip to main content
Outbound mail ports are blocked by default on every Opus Host VPS. This is standard practice at basically every hosting provider: a fresh VPS with open mail ports is one of the most common sources of spam on the internet, and we prefer not to be that provider. If you have a legitimate reason to send mail from your VPS, you can request the ports be unblocked. This is available on the free tier — no upgrade required.

​
Which ports are blocked

All three can be unblocked. Let us know which ones you actually need.

​
Requirements

Before we unblock, we check two things:
  1. A good reason. Tell us what you are building and why you need direct outbound mail. Common accepted use cases include:
    • Transactional email for a real app (signups, password resets, order confirmations).
    • A mail server you are running for your own domain.
    • A newsletter to a list of users who explicitly opted in.
  2. No prior abuse. Your account must have a clean history. Any previous violation of the Acceptable Use Policy — spam, phishing, or abuse reports — will get the request denied.
“I want to send bulk emails to a list I bought / scraped” is not a good reason and the request will be rejected. Doing it anyway after we unblock the ports will get your VPS suspended.

​
How to request an unblock

You can reach us through either channel:

Panel Support Ticket

Open a ticket from the control panel. Best for anything account-specific.

Discord

Ping us on discord.gg/opushost. Fine for quick requests.

​
What to include in your request

Save a round-trip by giving us everything up front:
  • The VPS ID or hostname you want unblocked.
  • Which ports you need (25, 465, 587, or all three).
  • What you plan to send — transactional email for an app, personal mail server, etc.
  • The domain(s) you will be sending from.
  • (Recommended) That you have SPF, DKIM, and DMARC set up on the sending domain, or a plan to set them up. This protects your deliverability and reduces the chance you will end up on blocklists.

​
Example request

​
What happens after

1

We review the request

Standard support response time applies. See Contact Support.
2

We unblock the ports

If approved, we lift the block on the requested ports for your VPS. No reboot required.
3

You configure your mail server

Set up your mail server (Postfix, exim, or an app-level library) and confirm you can send mail. Consider using a smart host / relay for better deliverability.

​
After you are unblocked

  • Set up SPF, DKIM, and DMARC on the sending domain. Without them your mail will land in spam or be rejected outright.
  • Set proper rDNS — open a ticket if you need help setting your VPS’s PTR record.
  • Monitor your outbound volume. A compromised app suddenly sending thousands of emails is a fast way to end up back on the blocklist.
  • Do not send unsolicited mail. Abuse reports will result in the block being reinstated and, depending on severity, further action on your account.
If you only need to send a low volume of transactional email, using a third-party relay (like Mailgun, Postmark, or Amazon SES) is often easier than running your own mail server — and their infrastructure is already trusted by major inbox providers.