Cold Email Software

Send cold email sequences with no effort. is an email service provider and email automation tool for B2B cold email outreach.
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✓  No credit card required
✓  Email warmup included
✓  Email server included

All of our plans will include the following supplementary features.

Our software is a meticulously crafted system designed to automate cold email outreach. Our comprehensive ecosystem offers a wide range of features to help you master your cold email strategy, all available at a single, affordable cost.

Email warmup

Initial email engagement and engagement maintenance are key factors when delivering emails. MailRush includes email warming feature with all paid plans.

Email validation

List higyene is a key factor when it comes to maintaining your email sender reputation. MailRush includes email validation features with all paid plans.

Email follow-ups

Scale up email follow-up by scheduling a sequence of emails. The sequence is stopped if your conversion event is triggered.

Single software solution for your B2B Cold Email campaigns is an email service provider that focus on B2B cold email campaigns. By automating best practices we maintain email sender reputation at all time. By having full control of the email service and automation software we can track and deliver emails effeciently.
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Intelligent Cold Email campaigns

When you run a MailRush campaign, the software will learn how contacts and email providers are reacting to your campaigns to automtically adjust the strategy to prevent reputation alerts and get the desired email folder placement.

Track performance indicators

Visualize data insights to understand your outreach campaign's dynamics with performance indicators: delivery rate, open rate, click rate, reply rate, and bounce rate.
  • Track delivery rates
  • Track open rates
  • Track click rates
  • Track response rates
  • Track bounce rates
  • Identify invalid emails
Free for 14 days
No credit card required
Deliver to the inbox
Email Warming

Email warming

Improve email deliverability by automating positive engagement actions. The email warnging service prevents emails from landing in the spam box. Visualize how your emails are reaching Gmail and G Suite.

Schedule email follow ups

Create drip sequences for your cold email marketing with a drag and drop tool for building, event-based, email follow up automations.
Email follow up automation

What makes us different?

More than a tool to send sales emails, acts as your Email services provider, and Email automation software in a single solution.

Cold email software

We are dedicated to continuously improving our cold email software by incorporating practical features to enhance its functionality. With our software, you can easily automate outreach campaigns, track important email events such as opens, clicks, replies, unsubscriptions, and other key metrics, and establish event-driven automated email follow-up sequences. Our platform prioritizes the sender's reputation, enabling long-term use with peace of mind.

Email service provider

Cyber Cast Intl, our parent company, serves as the data center provider responsible for operating the IP addresses, email servers, and the entirety of the ecosystem. The email service has been meticulously crafted to optimize B2B email outreach campaigns while safeguarding the sender's reputation and enabling primary inbox placement.

How does it work?

If you have a registered domain name and an email address, you are almost set.

Domain Name DNS

We will supply you with a set of DNS records that you will need to enter for your domain. MailRush provides a DNS validation tool for verification of the setup.

Contact List Import

Import CSV files with your leads, Validate the list to avoid invalid emails, personalize your email template, set sending cadence, schedule and, start sending.

Cold Email Sequences

Create an email follow up sequence that will send on later days. The automation will stop if you get a reply or any other email event you want to track.


Integrate your CRM with MailRush.


Effortlessly integrate your CRM software with by automating the real-time export of essential events, such as opens, clicks, replies, and unsubscribes.


Seamlessly integrate your CRM or external software with our API, allowing you to effectively import contacts to campaigns, unsubscribe contacts, and even transmit emails using our robust API.


Integrate with PipeDrive, HubSpot, Salesforce and other thousands of software. Export opens, clicks and replies events as they happens. Import contact to campaigns from your CRM to MailRush.

Frequently Asked Questions

Can’t find the answer you’re looking for? Reach out to our customer support team.

In general, if you do B2B cold email outreach, is for you. Some everyday use cases are:

  • Digital Marketing Agencies: Use cold email for promoting SEO services, Link Building, Social Media, and others.
  • Saas Providers: Cold Email is key for SaaS operators and targeting new customers. So, Use cold email to reach more prospects and to automate drip sequences and follow ups.
  • Animation Studios: Pitch to website owners to increase sales.
  • HR and Recruiters: Target the correct person for a company position by using cold email.
  • E-commerce: Reach more prospects by using cold email and drip campaigns.
  • Awareness: Organizations can use cold email outreach to generate awareness about a product, service, webinars, events, conferences, and other related offerings.

Here is a list of the minimum requirement to use MailRush.

  • Domain name: You need to own a domain name. It could be any extension (.com, .net, etc.). You will also need access to the DNS Manager as we need a few DNS records in your domain DNS for integrating with your domain name.
  • Google Workspace or a web hosting account: will provide you with the email servers to send outreach campaigns. In addition to the MailRush email server, you will need a Google Workspace account or a web hosting account to receive replies from potential customers. will not use your Google Workspace account or Web Hosting server to send outreach emails.

A cold email is an email that is sent to a recipient who is not expecting it, with the purpose of establishing a relationship, selling a product or service, or requesting something. Cold emails are typically sent to people who the sender has no prior relationship with, and are often used as a marketing or sales strategy to reach new potential customers or clients.

Cold emails can be an effective way to reach out to people and introduce yourself or your business, but it's important to be careful and respectful when sending cold emails. It's a good idea to clearly state the purpose of the email in the subject line and the first few sentences of the email, and to keep the email brief and to the point. It's also important to respect the recipient's time and attention, and to not send unsolicited emails too frequently.

Cold email can be an effective way to reach out to potential customers or clients, but it's important to approach it with care and respect for the recipient's time and attention. If done well, cold email can help you establish new relationships and potentially generate leads for your business.

However, it's important to keep in mind that cold email can also be seen as spam if it's not done well, and it can be easy for recipients to ignore or delete cold emails without reading them. To increase the chances that your cold emails will be successful, it's important to follow best practices, such as:

  • Personalizing the email and addressing the recipient by name
  • Keeping the email brief and to the point
  • Clearly stating the purpose of the email in the subject line and the first few sentences
  • Being respectful of the recipient's time and attention
  • Providing value to the recipient in some way (e.g., offering helpful information or resources)
  • Being mindful of local laws and regulations regarding unsolicited emails

Overall, it's important to approach cold email with a strategic and targeted approach, and to be respectful of the recipient's time and attention. If done well, cold email can be an effective way to reach out to potential customers or clients.

Cold email software is designed to help businesses and individuals send targeted and personalized emails to potential customers or clients. Cold email software typically includes a range of features that can help users create and send effective cold emails, such as:

  • Email templates: Many cold email software programs offer pre-designed email templates that can be customized with the user's own content and branding.

  • Personalization: Cold email software often includes tools for personalizing emails with the recipient's name, location, or other information. This can help make the emails more targeted and effective.

  • Automation: Some cold email software includes tools for automating the sending of emails, such as scheduling emails to be sent at a specific time or setting up drip campaigns (i.e., a series of automated emails that are sent out over a period of time).

  • Analytics and tracking: Cold email software may include tools for tracking the performance of emails, such as how many were opened, how many clicks were generated, and how many leads were generated. This can help users understand what is working and what is not, and make adjustments accordingly.

  • Integration with other tools: Many cold email software programs can be integrated with other tools, such as customer relationship management (CRM) software or marketing automation platforms. This can help users manage their cold email campaigns more effectively and efficiently.

Overall, the specific features offered by cold email software will depend on the specific product or service, and it's important to carefully consider which features are most important for your needs before making a decision.

An email warming service is a tool that helps businesses improve the deliverability of their email campaigns by gradually increasing the volume of emails sent to a specific domain or mailbox provider over a period of time. This process, known as "warming up" an email list, helps to establish the sender's reputation and reduce the likelihood of emails being flagged as spam or rejected by the recipient's email server.

Here is a general overview of how an email warming service works:

Get a account with Free email warming: To use an email warming service, you will need to sign up for an account and provide the service with information about your business and email campaigns. This may include the types of emails you plan to send, the number of recipients on your email list, and the frequency of your campaigns.

Warm up your email list: The email warming service will then begin the process of warming up your email list by gradually increasing the volume of emails sent to a specific domain or mailbox provider over a period of time. This may involve sending a small number of emails initially and gradually increasing the volume over the course of several weeks or months.

Monitor and track your results: As the email warming service warms up your email list, it will monitor and track the deliverability of your emails to identify any issues or problems. It may provide you with reports or analytics that show the performance of your campaigns and suggest ways to improve their deliverability.

Maintain your reputation: After your email list has been warmed up, it is important to maintain your reputation by sending high-quality, relevant emails to your subscribers and complying with email marketing best practices.

There are two components in our email warming automation.

  • Ramping up the daily sending volume: It will gradually increase the number of emails you can send in a day. Consequently, at the early stage of the account, the daily sending limit will be low, and it will increase as the account ages to reach the advertised daily limit for the plan of your choice.
  • Engagement Credits for Mail Warming: The system automates sending emails to a seed list on multiple providers to create positive actions and improve engagement levels. will not perform well for the following activities.

  • If you want to send a large number of emails at the early stage of the account without a warm up process.
  • If you expect a high frequency of email going out without any restriction or abuse/reputation control.
  • If you plan to send B2C email outreach campaigns.

Email deliverability refers to the ability of an email to reach the intended recipient's inbox. When an email is successfully delivered, it means that it has been accepted by the recipient's email server and is available for the recipient to read.

There are several factors that can impact email deliverability, including the sender's reputation, the content of the email, and the recipient's email server settings. Senders with a good reputation and high-quality, relevant emails are more likely to have their emails delivered, while senders with a poor reputation or spammy emails are more likely to have their emails flagged as spam or rejected.

There are also technical factors that can impact email deliverability, such as the recipient's email server settings and the configuration of the sender's email server. Ensuring that these technical factors are properly set up can help improve the deliverability of your emails.

Overall, email deliverability is an important factor for businesses and organizations that rely on email communication, as low deliverability rates can result in missed opportunities and lost revenue.

Email Deliverability is complex, and it depends on multiple factors, including but not limited to:

  • Email Account Warm up: All accounts need to get warmed up to build a reputation and perform better for inbox placement.
  • Domain name age: New domains are required to build a sending reputation.
  • Sending IP Address: The IP address needs to be warmed up to build a sending reputation. We suggest a dedicated IP for having more control over the sending reputation of the IP address assigned to your account.
  • List hygiene: High bouncing rate will result in a poor sending score.
  • Contact list: Your contact list needs to be well researched and relevant to your email copywriting.
  • Email Cadence: Space out your emails to avoid overwhelming a provider with connections.
  • Content Rotation: Do not send the same content over and over. Use Email Personalization in addition to rotating the content.
  • Seed List: Use an email seed list to generate engagement and positive activities.
  • Follow Anti-Spam regulations: Providers will check if you comply with international anti-spam regulations. Personalize your email content, give the user an option to unsubscribe, and add your email signature with your address.
  • Email Copywriting: Be conversational when creating your email templates; avoid click-baits and large email content.
  • Email Volume: Send a suitable number of emails and scale up the volume over time. Do not overwhelm providers with connections. Keep your email volume low at the early stage of the account.
  • Track Mail Deliverability Reports: Track and comply with the warnings received from email providers.
  • Sending Hours: Set a time frame when you want to send emails. Do not send emails 24x7.
  • Track Deliverability KPIs: Monitor your MailRush KPIs (Feedback Loop and Reputation Center) to adjust your campaign. Monitoring will help you to overcome blocks imposed by providers and improve inbox placement.
  • Track Inbox Placement in all providers: Track how your emails reach multiple providers, trial and error possible deliverability problems.
  • Click to Action: Make use of a clear and unique click-to-action to increase the conversion rate. Don't saturate your cold email template with multiple links.

When using MailRush, if you run a healthy cold email outreach campaign, your performance indicators will be good. We offer automation for many of the best practices, but inbox placement takes time and effort.

The difference relies on having control over the sender's reputation.

  • Shared IP: When using an SMTP with shared IP, your campaign will inherit the reputation of all the domains using that IP.
  • Dedicated IP: When using an SMTP with a dedicated IP, you are the only user using the IP. A Dedicated IP allows you to build a sender reputation that should perform well in long-term cold email campaigns.

Shared IP and dedicated IP refer to the types of IP addresses that can be used to send cold emails. A shared IP is an IP address that is used by multiple senders to send emails, while a dedicated IP is an IP address that is used by a single sender or organization.

There are a few key differences between shared IP and dedicated IP that can impact the success of a cold email campaign:

  • Deliverability: One of the main differences between shared IP and dedicated IP is the impact on email deliverability. Emails sent from a shared IP may be more likely to be flagged as spam or rejected by the recipient's email server due to the potential for abuse by other users sharing the same IP. On the other hand, emails sent from a dedicated IP are more likely to be delivered, as the IP is associated with a single sender or organization.
  • Reputation: Another important factor is the impact on sender reputation. When multiple senders use a shared IP, the IP's reputation can be affected by the actions of all the users. This can lead to deliverability issues if one or more of the users engage in spammy or abusive behavior. With a dedicated IP, the sender's reputation is tied to the actions of a single organization, which can make it easier to maintain a good reputation.
  • Control: Using a dedicated IP allows you to have more control over your email campaigns and the reputation of your domain. With a shared IP, you may have less control over the actions of other users and may be more at risk of having your emails flagged as spam or rejected.

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