How to Warm Up Your VPS Server IP Address for Cold Emailing?

Created On:
February 1, 2024
Updated On:
February 1, 2024
How to Warm Up Your VPS Server IP Address for Cold Emailing

Email remains a powerful channel for businesses and professionals alike. However, sending bulk emails, especially for cold outreach campaigns, can be a little tricky.  Because email clients impose strict sending limits.  

For instance, Gmail imposes a daily email sending limit of 500 emails for regular accounts and Google Workspace trial accounts. Google Workspace paid accounts have a higher daily sending limit of 2000 emails per user account. 

With a lead list containing 1000s of contacts, it’s practically impossible to send bulk emails. This is where the VPS server swoops in. A VPS server is a versatile solution that plays a pivotal role in ensuring your cold emails reach their intended recipients and not the dreaded spam folder.

In this article, I will explore the art of warming up your VPS server IP address for cold emailing. This process ensures high deliverability and engagement rates for your cold email campaigns. 

Let’s dive in. 

What is a VPS Server?

A VPS (Virtual Private Server) is a virtualized hosting environment within a physical server, providing dedicated resources and control. 

In the context of cold emailing, a VPS server is relevant because it allows users to set up and manage their email infrastructure, which is crucial for maintaining a positive sender reputation when sending bulk cold emails. 

Senders can control email delivery, warm up IP addresses, and optimize email deliverability for cold emailing campaigns by using a VPS server.

A VPS, or Virtual Private Server, is a type of web hosting service that provides a virtualized environment within a physical server. It's a middle-ground solution between shared hosting and dedicated hosting, offering more control, customization, and performance than shared hosting, while being more cost-effective than a dedicated server.

Why Use VPS Server Over Dedicated Server for Cold Emailing?

Using a VPS (Virtual Private Server) over a dedicated server for cold emailing offers several advantages. VPS hosting is cost-effective, making it suitable for budget-conscious email marketers. It provides ample resources for cold email campaigns, including CPU and RAM. VPS environments allow for IP address warm-up, a crucial step in establishing a positive sender reputation for bulk emailing. 

Additionally, VPS users can customize and configure email-related software and settings, ensuring optimal deliverability. Dedicated servers, while powerful, are often unnecessary and expensive for typical cold emailing needs, making VPS hosting a more practical and efficient choice for cold email campaigns.

Characteristics and Features of VPS servers

  • Virtualization: VPS hosting relies on virtualization technology to partition a physical server into multiple virtual servers, each with its own dedicated resources (CPU, RAM, storage, etc.). Each virtual server operates independently, as if it were a dedicated server.
  • Isolation: VPS hosting provides a high level of isolation between virtual servers. This means that the actions or performance of one VPS do not directly impact the others on the same physical server.
  • Root Access: VPS users typically have administrative or root access to their virtual server, allowing them to install, configure, and manage software, applications, and settings as needed.
  • Resource Allocation: VPS plans come with specific resource allocations (CPU cores, RAM, disk space, bandwidth) that can be scaled up or down based on your needs. This flexibility makes VPS hosting suitable for a wide range of applications.
  • Customization: VPS users can customize their server environment to meet their specific requirements. This includes choosing the operating system, installing software, and configuring server settings.
  • Performance: VPS hosting typically offers better performance compared to shared hosting, as you have dedicated resources at your disposal. However, it may not match the performance of a dedicated server, especially for resource-intensive applications.
  • Cost-Effective: VPS hosting is more cost-effective than dedicated hosting because you share the underlying hardware with other VPS users, reducing overall server maintenance costs.
  • Security: VPS hosting offers improved security compared to shared hosting, as your server is isolated from others. You have control over security configurations and can implement additional security measures.
  • Scalability: VPS hosting allows you to easily scale your resources as your website or application grows. You can upgrade your VPS plan to accommodate increased traffic and demands.
  • Managed vs. Unmanaged: VPS hosting can be either managed or unmanaged. In a managed VPS, the hosting provider takes care of server maintenance, updates, and security, while in an unmanaged VPS, you are responsible for these tasks.

What is a VPS Server IP Address?

A VPS (Virtual Private Server) IP address is a unique numerical label assigned to a virtual server within a VPS hosting environment. It allows the VPS to be identified on the internet and used for communication. Each VPS has its dedicated IP address, which can be associated with domain names to route traffic to the virtual server. This IP address is crucial for connecting to and accessing services hosted on the VPS.

Let's say you have a VPS hosting a website, and it has the IP address You can associate this IP address with a domain name like "" using DNS records. When users enter "" in their web browser, the DNS system resolves it to the VPS server's IP address (, and the browser connects to the VPS to access the website hosted there.

How to Warm Up Your VPS Server IP Address for Cold Emailing?

Let's dive into each step of warming up your VPS server IP address for cold emailing in more detail:

Step 1: Plan Your Warm-Up Strategy

Developing a well-thought-out warm-up plan is essential for success. Consider factors like your sending volume, the age of your IP address, and your email goals. A gradual approach is key. Start by sending a very low volume of emails to a small, engaged audience for the first few days. 

As you progress, gradually increase your sending volume to larger and less engaged segments of your email list. Your warm-up plan should span several weeks to ensure a steady and safe build-up of your sender reputation.

Step 2: Verify Your Email List

Before you begin your warm-up process, make sure your email list is clean and up-to-date. Remove invalid or inactive email addresses to minimize bounce rates and prevent damaging your sender reputation. 

Use email verification tools to check the validity of email addresses and remove any that are non-functional or likely to result in bounces.

Step 3: Set Up Proper Authentication

Proper email authentication is crucial to establish trust with email service providers (ESPs). Configure Sender Policy Framework (SPF) and DomainKeys Identified Mail (DKIM) records for your domain. These records verify the authenticity of your emails and prevent spoofing. Implementing these authentication mechanisms helps ensure that your emails are delivered to recipients' inboxes instead of being marked as spam.

Step 4: Gradual Volume Increase

Start your warm-up process with an extremely low sending volume. On the first day, send emails to a small, highly engaged group of recipients, such as colleagues or friends who have opted in to receive your emails. Begin with just a few dozen emails to establish a positive initial reputation. Over the following days and weeks, gradually increase your sending volume to larger segments of your email list.

Step 5: Monitor Key Metrics

Continuously monitor essential email metrics to gauge the health of your warm-up process and the engagement of your recipients. Key metrics to watch include open rates, click-through rates, and bounce rates. Low engagement or high bounce rates may indicate potential issues that need to be addressed. Regular monitoring allows you to adapt your strategy based on real-time results.

Step 6: Segment Your Email List

Segmenting your email list is critical for personalizing your warm-up strategy. Divide your list into smaller groups based on recipient engagement levels. Tailor your email content and sending frequency to each segment. Highly engaged segments can receive more frequent emails, while less engaged segments may benefit from less frequent communication. This segmentation approach maximizes engagement and minimizes the risk of recipients marking your emails as spam.

Step 7: Adapt and Adjust

Stay flexible and responsive throughout your warm-up process. Continuously adapt your strategy based on the results and feedback you receive. If you encounter issues such as high bounce rates or spam complaints, take immediate action to rectify them. Adjust your sending practices, content, or recipient targeting as needed to maintain a positive sender reputation and ensure the long-term success of your cold email campaigns.

By following these steps, you can effectively warm up your VPS server IP address for cold emailing, gradually building a strong sender reputation and improving your email deliverability over time.


Warming up your VPS server IP address for cold emailing is more than just a technical necessity; it's the key to effective outreach and communication. By following the steps outlined above, one can learn how to navigate the nuances of IP reputation, engagement, and authentication. 

Now that you know what is VPS server IP address and how to warm it up, you can confidently start your cold email journey.


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Author’s Details

Rajnish Das

Rajnish Das is an in-house writer at SmartWriter and SmartLead. She writes product-oriented, data-driven content for B2B SaaS audiences and educates them on marketing and sales topics. Her expertise includes outbound marketing techniques like cold emailing and LinkedIn outreach.


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Frequently asked questions

General Questions

What is Smartlead's cold email outreach software?

Email automation FAQs- Smartlead

Smartlead's cold email outreach tool helps businesses scale their outreach efforts seamlessly. With unlimited mailboxes, fully automated email warmup functionality, a multi-channel infrastructure, and a user-friendly unibox, it empowers users to manage their entire revenue cycle in one place. Whether you're looking to streamline cold email campaigns with automated email warmups, personalization fields, automated mailbox rotation, easy integrations, and spintax, improve productivity, or enhance scalability with subsequences based on lead’s intentions, automated replies, and full white-label experience, our cold email tool implifies it in a single solution.

How does the "unlimited mailboxes" feature benefit me?

Email automation FAQs- Smartlead

Our "unlimited mailboxes" feature allows you to expand your email communications without restrictions imposed by a mailbox limit. This means you won't be constrained by artificial caps on the number of mailboxes you can connect and use. This feature makes Smartlead the best cold email software and empowers you to reach a wider audience, engage with more potential customers, and manage diverse email campaigns effectively.

What do you mean by "unibox to handle your entire revenue cycle"?

Email automation FAQs- Smartlead

The "unibox" is one of the unique features of Smartlead cold email outreach tool, and it's a game-changer when it comes to managing your revenue cycle. The master inbox or the unibox consolidates all your outreach channels, responses, sales follow-ups, and conversions into one centralized, user-friendly mailbox.

With the "unibox," you gain the ability to:
1. Focus on closing deals: You can now say goodbye to the hassle of logging into multiple mailboxes to search for replies. The "unibox" streamlines your sales communication, allowing you to focus on what matters most—closing deals.

2. Centralized lead management: All your leads are managed from one central location, simplifying lead tracking and response management. This ensures you take advantage of every opportunity and efficiently engage with your prospects.

3. Maintain context: The "unibox" provides a 360-degree view of all your customer messages, allowing you to maintain context and deliver more personalized and effective responses.

How does Smartlead ensure my emails don't land in the spam folder?

Email automation FAQs- Smartlead

Smartlead, the best cold email marketing tool, ensures your emails reach the intended recipients' primary inbox rather than the spam folder. 

Here's how it works:
1. Our "unlimited warmups" feature is designed to build and maintain a healthy sending reputation for your cold email outreach. Instead of sending a large volume of emails all at once, which can trigger spam filters, we gradually ramp up your sending volume. This gradual approach, combined with positive email interactions, helps boost your email deliverability rates.

2. We deploy high-deliverability IP servers specific to each campaign. 

3. The ‘Warmup’ feature replicates humanized email sending patterns, spintax, and smart replies.
4. By establishing a positive sender reputation and gradually increasing the number of sent emails, Smartlead minimizes the risk of your emails being flagged as spam. This way, you can be confident that your messages will consistently land in the primary inbox, increasing the likelihood of engagement and successful communication with your recipients.

Can I integrate Smartlead with other tools I'm using?

Email automation FAQs- Smartlead

Certainly, Smartlead is designed for seamless integration with a wide range of tools and platforms. Smartlead offers integration with HubSpot, Salesforce, Pipedrive, Clay, Listkit, and more. You can leverage webhooks and APIs to integrate the tools you use. Try Now!

Email automation FAQs- Smartlead

What type of businesses sees the most success with Smartlead?

No, there are no limitations on the number of channels you can utilize with Smartlead. Our multi-channel infrastructure is designed to be limitless, allowing you to reach potential customers through multiple avenues without constraints.

This flexibility empowers you to diversify your cold email outreach efforts, connect with your audience through various communication channels, and increase your chances of conversion. Whether email, social media, SMS, or other communication methods, Smartlead's multi-channel capabilities ensure you can choose the channels that best align with your outreach strategy and business goals. This way, you can engage with your prospects effectively and maximize the impact of your email outreach.

Email automation FAQs- Smartlead

Do you provide me with lead sources?

Smartlead distinguishes itself from other cold email outreach software by focusing on limitless scalability and seamless integration. While many similar tools restrict your outreach capabilities, Smartlead offers a different approach.

Here's what makes us uniquely the best cold email software:

1. Unlimited Mailboxes: In contrast to platforms that limit mailbox usage, Smartlead provides unlimited mailboxes. This means you can expand your outreach without any arbitrary constraints.

2. Unique IP Servers: Smartlead offers unique IP servers for every campaign it sends out. 

3. Sender Reputation Protection: Smartlead protects your sender reputation by auto-moving emails from spam folders to the primary inbox. This tool uses unique identifiers to cloak all warmup emails from being recognized by automation parsers. 

4. Automated Warmup: Smartlead’s warmup functionality enhances your sender reputation and improves email deliverability by maintaining humanized email sending patterns and ramping up the sending volume. 

5. Multi-Channel Emphasis: Smartlead places a strong emphasis on multi-channel outreach. You can reach your prospects where they are with the LinkedIn outreach feature.   With Smartlead’s cold email automation software, you're always one step ahead in your outreach efforts, enjoying the freedom to scale your initiatives and seamlessly integrate with other tools—all while maintaining a focus on maximizing the impact of your outreach.

Email automation FAQs- Smartlead

How secure is my data with Smartlead?

Ensuring the security of your data is Smartlead's utmost priority. We implement robust encryption methods and stringent security measures to guarantee the continuous protection of your information. Your data's safety is paramount to us, and we are always dedicated to upholding the highest standards of security.

How can I get started with Smartlead?

Email automation FAQs- Smartlead

Getting started with Smartlead is straightforward! Just head over to our sign-up page and follow our easy step-by-step guide. If you ever have any questions or need assistance, our round-the-clock support team is ready to help, standing by to provide you with any assistance you may require. Sign Up Now!

How can I reach the Smartlead team?

Email automation FAQs- Smartlead

We're here to assist you! You can easily get in touch with our dedicated support team on chat. We strive to provide a response within 24 hours to address any inquiries or concerns you may have.

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