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Mass Email: What Is the Best Time to Send?

August 16th. 2025

Software

We are surrounded by notifications, social networks, and digital advertising, so getting a message to arrive, be opened, and generate an action is an increasingly greater challenge. However, mass email remains one of the most profitable and effective channels to communicate with customers and prospects.

The key is to do it strategically, and one of the most determining factors is choosing the best time to send.

In this article you will discover not only the most recommended schedules for your mass email campaigns, but also why this tool outperforms others such as SEO, SEM, or social networks in terms of conversion and profitability.

In addition, we will introduce you to Mailrelay, the platform that is helping thousands of companies send millions of emails with ease, expert support, and free plans.

Why is the sending time so important in mass email?

Even if you have the best subject line, an impeccable design, and irresistible content, if your message arrives when your subscribers are busy or offline, the chances of opening and conversion drop drastically.

Timing influences metrics such as:

  • Open rate: how many of your recipients open the email.
  • CTR (Click Through Rate): how many click on the links within the message.
  • Conversion rate: how many perform the action you expect (purchase, registration, download).

Sending your mass mailing at the right time can boost these indicators and therefore improve the return on investment (ROI) of your campaigns.

The best time to send mass emails according to studies

Various international user behavior analyses show that there is no single perfect time for all businesses, but there are clear patterns:

  • Midweek, Tuesday to Thursday: On Mondays inboxes are usually saturated, and on Fridays attention drops.
  • Mid-morning (9:00 to 11:00): People have already reviewed urgent emails and are more receptive to content of interest.
  • After lunch (1:00 to 3:00 p.m.): Especially useful for B2B sectors, when the work pace is more relaxed.
  • Evening (7:00 to 9:00 p.m.): Ideal for B2C audiences who check their email from their mobile after the workday.

The key is to know your audience and segment. With a platform like Mailrelay, you can run A/B tests to discover which schedules generate more opens and clicks according to your type of client.

Mass email marketing versus other channels

Some think that with the rise of social networks and search engine advertising, email has lost strength. The reality is the opposite:

  • Direct reach: You do not depend on changing algorithms like on Facebook or Instagram.
  • Lower cost: Mass email marketing campaigns have an average ROI of €36 for every euro invested, far above other channels.
  • Precise segmentation: You can send personalized messages based on the history, preferences, and location of each contact.
  • Ownership of the database: Unlike followers on social networks, your mailing lists are your own asset.

In short, mass email allows you to control the message, timing, and audience, at much lower costs than SEM and with more stable conversion than social networks.

How to choose the perfect time for your mass mailing

  • Analyze your database: Are they office professionals or end consumers?
  • Review historical data: If you have already sent campaigns, check at which times you obtained the best results.
  • Test and adjust: Use A/B tests to compare results of mailings at different times.
  • Consider time zones: If your business has clients in several countries, segment by location so each group receives the email at their ideal time.
  • Use smart automation: Tools like Mailrelay allow you to schedule mailings according to each subscriber’s time zone and past behavior.

Advantages of using Mailrelay for mass email

The success of your campaigns depends not only on the content and schedule but also on the tool you use. This is where Mailrelay makes the difference:

  • Generous free account: Send up to 80,000 emails per month and manage up to 20,000 subscribers at no cost.
  • Expert human support: A team that advises you and resolves doubts in your language.
  • High deliverability: Optimized so your emails reach the inbox and not the spam folder.
  • Advanced automations: Segmentation, behavior-based mailings, and A/B testing to find the best sending time.
  • Ease of use: Intuitive interface that allows you to create professional campaigns in minutes.

These advantages make Mailrelay the ideal option for companies that manage large volumes of mass email and need consistent results.

The perfect moment exists, but you have to find it

The best time to send a mass email depends on your audience, your sector, and your objectives. While studies offer recommended time slots, the most effective thing is to analyze, test, and optimize based on your own data.

With the support of a solid platform like Mailrelay, you can automate this process, segment your audience, and ensure that your messages arrive at the moment of greatest impact.

Try Mailrelay for free and send millions of emails with the expert support your business needs.

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