Sending Emails Without Limitations: The Solution to Microsoft’s New Outlook Restriction
Microsoft’s new limitation restricts the number of external emails that can be sent within an organization, potentially blocking email delivery entirely. How can you overcome this? The solution is here.
Sending emails is a daily practice in every organization. Teams like technical support, HR, procurement, and customer service regularly send operational and marketing emails — such as password reset requests, registration confirmations, customer updates, event invitations and more.
Until now, organizations have been used to email delivery being a technically simple and convenient process, allowing them to focus mainly on content, message planning, and timing.
However, just this month (April 2025), Microsoft, which operates Outlook and Exchange Online services, announced a new policy: limiting the number of recipients to whom emails can be sent within 24 hours. This limit, called Tenant External Recipient Rate Limit (TERRL), was implemented after a significant number of emails were ending up in spam folders. These incidents were damaging Microsoft’s sender reputation, causing their deliverability (i.e., the ability of emails to reach their destination) to decrease. Through this move, Microsoft aims to improve its server ratings and maintain reliable, accurate email delivery.
For companies and organizations, this change presents a challenge: It is no longer possible to fully rely on Microsoft’s infrastructure for communication with customers, partners, or suppliers.
Although the sending limit varies by organization (calculated based on factors like the number of licenses), there are scenarios where even a single message or campaign could trigger a block.
What does this mean in practice?
Any email sent to contacts — whether marketing emails sent directly from Outlook, operational emails like password resets or account activations, event registration confirmations, external tender announcements, or day-to-day communication with suppliers, partners, and customers — could encounter delivery restrictions and even be blocked if the daily quota is exceeded.
This is exactly where inwise steps in with a precise set of solutions:
Large-Scale sending: inwise is not limited by sending volumes, allowing you to distribute messages and updates securely and easily. You can create contact lists based on different needs, such as welfare activities, events, promotions, important updates, or management announcements. Lists can also be segmented by specific groups like all employees, department heads, branch locations, retirees, or custom segments based on criteria such as employees hired in the last three months or retirees in the past year.
Optimal data protection: inwise integrates seamlessly with a wide array of organizational systems, ensuring that your data and mailing lists remain securely owned and managed within the organization, without the need to export data outside the company.
Compliance with quality standards: The system adheres to rigorous international security standards, regulatory requirements and conducts proactive cybersecurity actions. This high level of security guarantees that emails sent through inwise will reliably reach their intended recipients.
Ease of use: The system is designed for simplicity and clarity, offering users a seamless experience. It’s easy to operate without technical or design expertise, yet it’s secure and well-suited for IT professionals and technical teams.
Advanced AI features: We continually update and refresh inwise with AI-based features that enhance the user experience. The content writing tool helps create subject lines, CTAs, and body text that suit specific needs and styles. Similarly, the image design feature allows you to create visuals based on prompts written within the system. You can also design newsletters, landing pages, and marketing emails in line with your brand’s tone and characteristics with just a click.
In conclusion, relying solely on traditional email infrastructure can now severely limit organizational communication. Moving to a secure, efficient, and user-friendly platform like inwise enables companies to continue managing crucial interactions with customers, partners, and suppliers safely, effectively, and without disruption.
