Why do most VPS providers block Port 25 in 2026?

Most VPS providers block Port 25 to prevent their IP ranges from being used for outbound spam. By blocking this port, they protect their IP reputation. Legitimate users can often request to have this port opened after verifying their identity and intent.

Which VPS providers have Port 25 open by default?

As of 2026, providers like Contabo, RackNerd, and OVHcloud are known to have Port 25 open by default or are more lenient with requests. However, some may still have sending limits (like Contabo's 25 emails per minute) to ensure network health.

Can I use Port 587 or 465 if Port 25 is blocked?

Yes. Port 587 (STARTTLS) and Port 465 (SSL/TLS) are the modern standards for email submission. While Port 25 is still used for server-to-server relay, most modern mail setups should prioritize 587 for client-to-server communication.

How do I request a VPS provider to unblock Port 25?

To unblock Port 25, you usually need to open a support ticket. Providers often require you to provide a valid business reason, a domain name with a clean reputation, and properly configured SPF, DKIM, and DMARC records.

Does Contabo still allow Port 25 for bulk emailing?

Contabo allows Port 25 but monitors for spam activity. They are a top choice for self-hosted SMTP servers in 2026 because they provide high RAM and NVMe storage at a low cost, which is ideal for running panels like CyberPanel or Postal.

List of VPS providers with Open Port 25

Welcome to hostnamy and today we are going to see the List of VPS providers with Open Port 25. Before we truly understand port 25 and its usefulness, we need to understand what is port and its roles in the overall internet communication.

To make things more quick, the below table summarizes the List of VPS providers with Open Port 25.

Contabo	VISIT CONTABO
Hostwinds	VISIT HOSTWINDS
VPSBG	VISIT VPSBG
VERPEX	VISIT VERPEX
ISHOSTING	VISIT ISHOSTING

What is port in Computer Networking.

Referencing Cloudflare, a port is a virtual point where network connections start and end. As a metaphor, think of an IP address as the physical address of an apartment building, the port number is the specific apartment number which you can use for a particular purpose. You can also think of an IP address as a unique identifier of a physical computer, ports are specific parts or services in the computer that performs a particular service or function. Ports are software-based and managed by a computer’s operating system. Ports allow computers to easily differentiate between different kinds of traffic.

Popular Ports and their Functions

Here are some few ports that and their functions:

Ports	Protocol	Common Function
Port 22	SSH	Secure Shell: Used for remote terminal access to manage your VPS.
Port 80	HTTP	Web Traffic: Used for standard, unencrypted website browsing.
Port 443	HTTPS	Secure Web Traffic: Used for encrypted website browsing (SSL/TLS).
Port 53	DNS	Domain Name System: Translates domain names into IP addresses.
Port 3306	MySQL	Database Access: The default port for MySQL and MariaDB databases.
Port 143 / 993	IMAP	Used for receiving and syncing email. Port 143 is standard, while 993 is the secure (SSL/TLS) version
Port 110 / 995	POP3	An older protocol for downloading email. Port 110 is standard, and 995 is secure.
Port 25	SMTP Relay	It is primarily used for server-to-server communication. When your VPS sends an email to a Gmail server, it uses Port 25.
Port 587	SMTP Submission	The modern standard for client-to-server communication. When you hit "send" in Outlook or Thunderbird, your app usually connects to your VPS via Port 587 using STARTTLS encryption.
Port 465	SMTPS	Originally intended for SMTP over SSL. While technically deprecated by some standards, it is still widely used for secure email submission.

Why do we Need Open port 25

In the context of looking for VPS providers with open Port 25, it is important to understand that this isn’t just “another port.” It is the backbone of global email communication. Without Port 25 being open, your VPS is essentially a post office with its doors boarded up. it can write letters, but it can’t send them to other post offices. The implication of this is that; without port 25 open on your VPS server, it can only receive emails and not send out emails or mass emails to other servers.

Port 25 is the original and primary channel for the Simple Mail Transfer Protocol (SMTP). Established in 1982, it was designed specifically for routing email across the internet. In technical terms, it is the default port for Message Transfer Agents (MTAs) to communicate with one another.

Other Email protocols (Port 587, and 465)

While Port 25 is used for moving mail between servers, Ports 587 and 465 are used for submission, sending mail from an app or client (like Outlook) to your VPS.

Port 587 (SMTP Submission): This is the modern industry standard. It uses STARTTLS encryption, meaning it starts as a plain connection and upgrades to a secure one. It requires authentication (a username and password), which helps prevent spam.

Port 465 (SMTPS): This is used for Implicit TLS. Unlike Port 587, the connection is encrypted from the very second it starts. While once considered outdated, it is still widely used by many mail clients for a more secure “wrap” around the communication.

Key Difference: If your goal is to send mail to other servers (like Gmail), you still need Port 25. Ports 587 and 465 are only for getting the mail from your device to your own server.

Popular VPS provider with Open port 25

Let’s explore some VPS companies with port 25 open. It should be noted that some of these providers have port 25 open by default, but for some; you have to requests through support before they can open it for you. The reason for this is so as to avoid abuse and to prevent mass spam bulk emails.

Contabo (Open port 25 sending 25 emails/minute)

Contabo is a highly popular choice for those searching for VPS providers with open Port 25, primarily due to their budget-friendly prices. They are well-known in the self-hosting community for providing massive amounts of RAM and storage, which is ideal for running resource-heavy mail servers like Mailcow or iRedMail.

TRY CONTABO NOW

Contabo generally leaves Port 25 open by default for new VPS instances. However, they maintain a strict “Anti-Spam” policy to protect their IP reputation.

Sending Limit: To prevent abuse, Contabo typically enforces a soft limit of approximately 25 emails per minute. This is more than enough for transactional emails, newsletters, and personal use, but it discourages bulk spammers.
IP Reputation: Because they are so accessible, some of their IP ranges can occasionally be found on blacklists. It is highly recommended to check your assigned IP on MXToolbox as soon as you deploy your server.

What Contabo Offers

High-end Virtual Private Servers with the best price-to-performance ratio on the market. So, contabo is regarded as the cheapest VPS provider in the market.
Powerful AMD CPUs and NVMe SSDs with plenty of RAM and traffic.
Full root access with your choice of OS – spin up quickly with API, CLI and custom image options.
9 Regions, 11 Locations, Global Availability. From the USA to the UK, from Europe to Asia and Australia, choose your ideal hosting location for low latency worldwide.
Security: Contabo servers is always-on DDoS protection, strict access controls, and automated backup options safeguard your virtual server and help you stay compliant and resilient.

Try Contabo Now

Hostwinds (Open port 25 sending 25–250 emails/minute)

Hostwinds is a very popular company in the web hosting industry. Unlike many competitors who offers open port 25 that require you to wait 30–60 days before requesting an unblock, Hostwinds generally leaves Port 25 open for their VPS instances by default. However, they are very proactive about protecting their IP reputation.

While the port 2 is often open by default, new accounts may undergo a brief manual verification if the system detects high-volume mail activity immediately after signup. On their managed plans, they sometimes implement soft hourly limits (e.g., 25–250 emails per hour depending on the plan level) to prevent automated botnets from abusing their network.

Try Hostwinds Now

What Hostwinds Offers

Monitoring System: Hostwinds offer a real-time monitoring service for all VPS Hosting plans whereby they proactively monitor your server and automatically open a support ticket for you in the event of a technical issue.
Instant Scalability: Increase your server resources instantly by upgrading to the next tier of your Unmanaged Linux VPS plan! Upgrading is simple with Hostwinds, allowing you to scale your server based on your needs.
Nightly Backups: Hostwinds automated nightly backups provide you with an easy way to ensure your Linux virtual private server’s data is backed up. The system will backup all of the data to their object storage service. You can configure when these backups run and how long you wish to store the backups for. You also have complete control over the recovery process and can choose to restore an entire backup or select the individual files you need.
Other features offered By Hostwinds: 1 Gbps Ports, Solid State Drives, Snapshots, 99.9999% Uptime, Custom ISO’s, Friendliness Guarantee, Multiple Locations, Enterprise Firewall.

Try Hostwinds Now

ISHOSTING

What Ishosting Offers

Full Root Access
Open ports 25, 465 and 587
Monitoring and Recovery
Operating System Choices: Support for various Linux distributions (Ubuntu, Debian, AlmaLinux, CentOS, Rocky Linux) and Windows versions.
CMS Support: Easy installation of popular CMS platforms like WordPress, Joomla, and Drupal.
24/7 Technical Support: Live chat and ticket system available.
Free DDoS Protection: Standard protection is available for servers in the Netherlands.
Control Panels: Compatibility with ispmanager, DirectAdmin, HestiaCP, aaPanel, Fast Panel, and more.
Project Migration: Free migration services to transfer your existing projects to iShosting VPS.
IPv6: You can get IPv6 upon request via support

Other VPS Providers with port 25 Open

Verpex

VPSBG

So, these are our list of vps providers with port 25 open. As of the time of writing this post, port 25 is open in these providers. Remember that vps companies policy may change in the future and may require manual approval. So, I advice is to contact support of these providers to know the status of their respective port 25.

Pls don’t forget to comment what you think about this article, and if you have other VPS companies with port 25 open that isn’t mentioned here, pls you can share it in the comment section; so that We can update this article. Thank you for reading.